For the past year or so, the Motion Picture Association of America has steadfastly denied that it will add a new "SA" -- for "substance abuse" -- rating to warn parents about films that glamorize drug abuse. But MPAA President Jack Valenti -- whose standard line on the subject is "We have too many ratings already" -- now says the policy review committee of the movie ratings board has drawn up new, stricter guidelines for the cinematic depiction of drugs. No word yet on whether the use of drugs in a movie will automatically mean a more restrictive rating, or how the rules would work; it seems safe to assume they won't ban all portrayals of drug addiction, the way the Hays Code did in the 1930s. A Quick Hit List

Which film made more money, "In the Heat of the Night" or "Desperately Seeking Susan"? D.W. Griffith's "The Birth of a Nation," the original "King Kong" or the 1970 Candid Camera-hits-the-big-screen offering "What Do You Say to a Naked Lady"? The answers are "Susan" and "Naked Lady," according to a recent chart in which Variety ranked the 1,500 or so biggest moneymaking films. The list makes it possible to spot the biggest non-Steven Spielberg or George Lucas film ("Ghostbusters," No. 6), the biggest pre-1970 movie ("The Sound of Music," No. 18) or the biggest pre-1965 movie ("Gone with the Wind," No. 21). The chart is top-heavy with recent films, given inflated ticket prices and much broader releases; in fact, warns Variety, "pictures released in different eras cannot be compared directly." Banned in Finland

"Born American" is a thriller about three young Americans who stray across the Russian border while hunting in Lapland and wind up in a Soviet gulag where a nonstop chess game is played with prisoners. Clearly, it's squarely in line with the depictions of the Soviet Union in films like "Rocky IV," "Rambo" and "White Nights." And that's too much for Finland, which last week banned "Born American." The film is a joint Finnish-American production, but the Finnish State Film Censorship Board found that it ran afoul of a provision that allows it to ban a movie that "may be considered a slur on a foreign power." The ban was invoked, said Finland's head censor, because of "explicit violence" and "its portrayal of Russians as sadistic brutes." The provision allowing films to be banned on political grounds has never before been invoked. Corman's 'Little' Deal

This summer, Warner Bros. plans to release "Little Shop of Horrors," based on the off-Broadway musical that was itself based on the 1960 horror film. Six months later, Roger Corman will re-release the original movie; the veteran low-budget producer has just negotiated a deal that gives him that right, and he says he'll observe the six-month window "to the day." Corman already receives royalties from the play and will receive them from the Warners film, while his original has returned $6 million to $7 million -- not bad for a movie made for $30,000 and filmed in two days and one evening of shooting. Revolutionary War

Five years ago, an Academy Award-winning director made an ambitious, lengthy and expensive film about romance in the midst of a bloody real-life conflict; when the smoke cleared, Michael Cimino's "Heaven's Gate" was a commercial and critical flop that was largely responsible for the demise of its studio, United Artists. (Owner Transamerica got sick of the movie business and sold UA to MGM, ending much of its autonomy.) Last year, an Academy Award-winning director made an ambitious, lengthy and expensive film about romance in the midst of a bloody real-life conflict; the smoke hasn't cleared yet, but Hugh Hudson's "Revolution" looks to be a severe commercial and critical flop. And next week, its producers -- Goldcrest Films, a British-based independent not in the same league with a UA -- will hold an emergency meeting of key shareholders. Word is that the company is so financially strapped that it may sell out to the highest bidder.