Holley 4412 500cfm Performance?

The 4412 was a good replacement for Ford 2 barrels. I adapted one to my 69 Roadrunner-383 back in the day and didn't notice much difference over the stock AFB. Back in the day they sold for $49.95. lol

Well that aleast gives me some hope. I know though if I'd put a 4bbl on it itd scream like no tomorrow, but I just wanna make it "look" sluggish. My plans are to build the 451, modded 516 heads, manifolds, bigger cam, etc. Also I got it for a real good price...FREE!!