Dave,

I guess the answer would be that any 390 4V of the right vintage etc.., would likely do. Given money constraints, time constraints and the fact I have waited 20 years to do this (my teenage sons want to help) I would say a realistic expectation is to just get a decent 390 4V to rebuild. What follows from that is the other part of my question about what range of years and models of car had 390's/428's that would fit?

Rob