James T. McIntyre Jr. just may be as perfect a composite of the higher ranking Georgian in the Carter administration as can be found in one person: He works from dawn to dusk as deputy director of the Office of Management and Budget; ranks as a family man of the first order, and eschews frivolity.

McIntyre, 36, grew up in Vidalia, Ga., says he "worked my way up the hard way," working his way through college and law school at the University of Georgia, and rising quickly in state government jobs to become Georgia budget director under Carter and later George Busbee.

In answering the call of his President. McIntyre has had to sacrifice - another familiar word in the new administration. In McIntyre's case, he's given up gracious Georgia living on a 15-acre farm about 30 miles north of Atlanta. "It's not in any town," of says. "It's out from Alpharetta."

He raises Arabian horses there; he says his wife and three daughters enjoy riding and he has four pure bred Arabians among seven horses. In what spare time he has, and he makes plain that there hasn't been much. MacIntyre has been looking for a place with some ground, around Great Falls, Va., or Potomac, where he can move up the family, and all the horses.

They've stayed behind until the end of school; meanwhile has been staying with his in-laws in Arlington.

It's been a fairly spartan existence for since he's moved up. No horseback riding, no tennis, and his jogging routine has been rduced to a walk.

Instead, It's been long days in his large OMB office on the second floor of the Executive Office Building. In at 7:15, out at 8. "Last night I left about 10:30," he says.

But didn't Carter say there was going to be "fun" in government?

It seems to depends on one's definition of fun. "I think fun and hard work are not mutually exclusive," says McIntyre, an opinion the President apparently shares.

McIntyre is "trying to get the guidelines out on zero-based budgeting and trying to get the President's government reorganization study underway."

He could have more than 1,300 long days aheard of him.