Vvt lock or not

I just purchased a 5.7 crate engine for my 71 Charger and am considering putting in a 392 (6.4) cam. I have searched around and there are more questions than answers and i am hoping someone here might be of help.

1. Since I have an Eagle engine, I suspect I need a 392 cam for an eagle engine?
2. some say the valve springs need to be replaced yet some say you don't unless you are going to pull deep RPM
3. my engine is a non-MDS engine but does have VVT (as I think they all do). Do I need a non-MDS cam?

I appreciate any information/assistance on this issue