Can I bolt vortec heads onto the old 3.8L, 1983 vintage, and then go on to mount MPI injection on that??
A competent machine shop/engine builder should be able to advise you on that one.
Haven't come up with any V6 info. You might leverage some info from
Mortec's CHEVY small block V8 Casting Numbers :
A Page Search for vortec in the Blocks and Heads sections will yield some possible candidates.
Use the part numbers to confirm what you're looking at when crusing the boneyard.
Needless to say that these engines will be commanding higher prices than carbureted engines
and still require marinizing and tweaking . . .
Paul Kane Chelsea, PQ
Building the Glen-L Hot Rod : http://www.boats.chelseacoachworks.com