...will a T34 DO 40psi?.....

Mike i think i would retain std gearing as i know what you mean about 4.44!!!

Billys engine is just like my old T38 specced one but maybe a little quicker...so bgeen there done that and will agree VERY fast...BUT if i restrict it as Stu says on a .63 then massive torque but say 18psi at top end for the 300ish bhp....then i cant blow it up thru no fuel top end NOT that i have ever done that