Pretend I’m an idiot.

318 2bbl was listed as 230 hp gross. Gross is how Dyno's measure hp. A good 4bbl on top of a good engine with headers and duals would really help it breathe. Not all '85's had roller cams, but I don't think you'd need a cam swap for your goals.

Just look at CL, Ebay, right here on FABO, or Face book. Deals can be had on all this stuff.
Oops. I thought the "I’m hoping to get 250-300 out of this thing" was sell it for dollars and not about horsepower. LOL