Exactly the same 100 points, I would assume. I doubt that he attempted anything outside of the 3-point line.
He wasn’t too far out of it when he wasn’t shooting in the paint. I’d guess mid-range jumpers and bank shots within twenty feet.
Jerry West blasted from a distance that would make the 3-point line matter now. However, that is an other topic.
ADDITIONAL EDIT:
If the opposing side had been making three-pointers, he may have scored even more. Their field goal percentages would have been far lower, which would have given Wilt’s side more possessions—and more opportunities to score because his teammates were purposefully passing him the ball.
Before the NBA adopted the three-point line, on March 2, 1962, Wilt Chamberlain scored 100 points in a single game. How many of his field goals would have come from three-point range if we were to theoretically apply the three-point line to that game? It’s hard to give a precise response without particular information about it. It is safe to infer, nevertheless, that Wilt Chamberlain would have scored even more points overall if he had converted some of his field goals from beyond the three-point line.
That’s a pretty good question; perhaps in order to determine who has the most points, they could compare two-point conversions against two-point conversions. Or, when attempting to compare points-per-point, measure two points for each three-point shot scored by a player.