I have been running a 500 Edelbrock on my .80 over 250 (260) Chevy for a few years. It does have an RV cam and headers with duel 2 1/4" exhaust and Hei. Mostly I just putt around, it's definitely a daily driver. When I drop down a gear and ask for more power it balks for just an instant and then goes like hell. I'm thinking that I maybe should have gone with a 390 Holly. I'm no expert and maybe it's just a simple tuning fix.
I think either one of these carburetor would be good for your application. Hopefully you can get a more definitive answer. I'm very happy with my 500.
