[cycleguy55]

If I had "a complete unrebuilt 390 and a couple 352s" the decision would be easy - forget the SBF and build the Cobra around the FE. You could always do a basic rebuild / refresh on any of those and use them for a while "as is" and I'm sure they'd provide plenty of thrills. If you decide you want more you can always install a stroker kit later and build yourself something bigger / better / faster - now or later.