Starting over in so many ways

[hi-tech cobra]

Some of you guys may remember my build back in 2008, I had just purchased a KC482 and with Nick Acton's awesome help (actually he did most of it and I helped) cut out the small block engine mounts and welded in FE mounts.

Allot has happened since, and the 482 had to be sold before ever firing her up.
Now have an old 390 as a temporary replacement just to get her on the road. I need some help with upcoming decisions like:

1. The engine has been sitting a long time and has lots of crud in the lifter valley, I'm thinking a scraper and shop vac unless there's a better way to flush out all the junk from the internals.
2. I noticed some of the valves are rusty, any chance to use without much expense or should I get some new alum heads?
3. If I do get new aluminum heads for the 390, is it possible to use them on a future BBM 427 build?
4. If she won't run and a rebuild is in order, is there a stroker kit that can be used on the 390 and the BBM build?
As you can tell I'm looking to the future 427 build to utilize as many new components as possible.