RAII heads typically fetch $3000-4500 depending on condition, hardware and completeness. The RAII Firebird exhaust manifolds $1500-2500.
For half that, you could get a set of ported 72 CC E Heads and some nice Headman or Thorley's, new cam, lifters and rockers...and IMO have better performance.
Yes, but would it look stock?
1968 400 Coupe, verdoro green, black vinyl top, auto 1969 GTO Judge coupe, Carousel Red, manual 1971 Trans Am, cameo white, auto 1970 Buick Skylark Custom Convertible 350-4(driver), Fire Red, white top, auto 1972 Buick GS Stage 1, Royal Blue, black vinyl top, auto