I have a friend who has a 71 Demon with a blown 340, he is running a 641 blower on it and it develops between 625 and 725 HP depending on which pulley he feels like using
my engine is going to be a bit lamer 350-400 maby if im lycky . going for 1,92 overdrive thats the max what the weiand can rev.
going to be about 8 to 9 psi max