Ford used a lot of engine blocks in different applications, which can be very confusing. The differences sometimes are just stroke length, other times, in combination with head space and stroke length. Paul is the 429/460 expert here. If you wait a while he should check in and be able to guide you. He also has a website where he builds all sorts of big block Ford motors, and has lots of useful info in regards to heads etc.
www.highflowdynamics.com/