We started out with a supermag. What is your plans for blower,drive ratio, fuel system etc. Our build was for a very specific class with some very weird rules.The littlefeild blower we had was new from littlefeild. It was standard helix with a parker bottom and 9.5" top.It would make 14-15lbs of boost @8000rpm's. Bird hat w/ 80a pump. Fuel only injected thru hat no port nozzles (class rules). This one thing that I will warn you of we had alot of trouble withthe front cyls running hot and the back dead cold. Jetting if I remember right was 68's in the front and 29's in the back with very little heat in the back. We found that if you turn the manifold backwards it helped We couldn't run a set back deal. It's not real hard to do.If you have any more questions I would be glad to talk to you and try to help.PM me your number. Good luck