I'd add that there's a couple things I'd take the time to do BEFORE you buy anything.
I'd take a CYLINDER PRESSURE reading off every cylinder -- to see what kind of cylinder pressures you're current motor is making. That way - when you take your heads off to see what you have... you'd know if you can squeeze down on the chamber size - or perhaps go bigger. But if you don't have a "base" of education to start with - you're just guessing.
I'd also do a leak down test on the current motor... to check it's health before you spend a bunch of money on heads and go fast parts only to find out you're wasting your time and energy.
Heads and EFI are going to cost you $3500 bucks... for barely much more you can buy a COMPLETE engine with EFI and aluminum heads.... I only paid $4500 for a complete Smeding Performance 383 stroker motor with FAST EFI! All tuned all done!
It was "on sale" but my point is - with a bit of shopping you might be able to do a motor swap instead of a head and efi job. Your motor should be worth "something".... if it's decent and runs decent... so you'd subtract that from your cost as well.
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