My 318 Duster

Hello - I am new here. My car (Which is my first one) is a 1974 Plymouth Duster with the original 318 and torque flight auto. It was pretty stock when I bought it back in May. But now for the winter the 318 will be re-built.

over the summer duel exhaust were added, and the replacement of the horrible headers to proper manifolds. The engine will come out in a couple weeks. So far I have purchased a 570cfm Holley street avenger 4-barrel. My question is how power do you think I would achive with the following.

-Already have Holley 4-barrel
Plan on purchasing Edlebrock performer intake, new camshaft, bigger valves, new distributor with an updated ignition, new vlave springs, pushrods, timing belt. Among other small things.

I am hoping to get 300hp out of all that. What do you guys think? Still undecided on the cam and vavles.

Thanks - later