What kind of crank did you buy? If it is a Hot Rods, first money spent should be outside bearing swaps(TZ on right, at least a Max Load on the left) and Welded. I have the Hot Rods and from the research I have done, these are the problem areas. Then as everyone else has stated, some porting. Then you need to have the domes cut on your stock head to comensate for the increased stroke, or buy a noss head from whoever you pic as a builder and have them cut the domes to there profile to compensate for the added stroke and put you in the compression range that responds to their porting best. That should just about exhaust your extra money, if you're lucky, maybe even get you a billet impeller also.
Then as soon as you get the extra money, you are gonna want a billet clutch basket for the extra power(stock one will wear fast), at least some beefier clutch springs(Toomey) if not a lockup to hook up the extra power, and then longer swingarm to keep from flipping over, which in turn will make you need a longer chain, which in turn will make yoy buy new sprockets.........I am sure you get my point. But it will all be worth it in the end!!!!!!
P.S. Just called Jeff at F.A.S.T. for a chain, answering machine says he is not takeing on any more work untill June 15th. You are going to wait in line anywhere else though.