There the same but different, Most parts will interchange .research research research
Go get a good late model roller cam motor junk the fuel injection and bolt on your favorite carb and manifold .For bang for buck thats the way to go or you could spend $1000,s setting up the injection and tweaking it to get small gains.
The real bonus is in getting the roller cam .
Ive been told that the early cranks are better as they have the 28oz offset balance instead of 50oz in the late motors,but have to be matched with the correct flywheel/flexplate-harmonic balancer.
oop's I for got about ADR's Just by a early falcon and do what ever you want to the motor