i gave an old weiand team G inlet manifold (1970's stuff) an acid bast once at a machine shop, $10. came out mint!
had to paint it afterwards as it was a bit pitted after the oxidation was lifted.

i feel the KC ones aren't as good quality material as the edelbrock ones, only beacuse of the corrosion i have seen always seems to be on the KC ones, but edelbrock not so much.

new edelbrock ones are under $300 now, maybe $250?. Make sure it takes your rochester spreadbore (which it should do, it should take take both squarebore and spreadbore). you can special order "edelbrock performer Q-Jet" if they have changed...