383 or 440?

the problem with the 440 is that is that it has a cast crank and low comp. if you are not going to buy internals (crank,rods,pistons) then build the 383 it has a steel crank and is internally ballanced. the 440 is externally balanced and is prone to taking rod and main bearings out with higher rpms. the 383 will rev to 6500 the 440 about 4600 is all I would safely turn.