all i can say is that more cubic inches are always better when you're pushing for big horse power.... and to handle nitrous and a supercharger, you better be putting the highest of quality forged pistons, rods, crank in there... plasma molly rings... best bearings you can find, have a thick bore on the block to insure nothing goes thru the cyliner walls... and even then you're gonna be rolling the dice everytime you hit that nitrous... its better to not put nitrous on cars if you're pushing really heavey compression... unless you really have the money to do it.... i've seen engines blow on the strip where the heads blow off thru the hood and such...