Building a chevy 350 engine for 2500$ I want 350hp, HELP?

I blew my 350 in my s10 last year. I am wanting to build (or buy) something to put me around the 350 hp mark and be dependable. I can get my hand on a 89 chevy crate 350 with 30k miles for about 300$. I will be using a lot of my old parts which consist of: edelbrock 650cfm carb, kn aircleaner, hedman shorty s10 v8 headers, dynomax mufflers, electric fan, 3.42 posi rear. The crate 350 does not have the port for a manual fuel pump so I will have to have run an electric pump, will this mess with the carb? I have heard about using the vortec heads and swapping the cams out. but dont know which ones to get? also would I benefit more from just buying a 96+ vortec 350? maybe I could find a wrecked truck or something. I want part/model numbers.I plan on getting it running by spring so I have a few months to build or find something. also, would I benifit much from fuel injection? I know its more of a pain in the ***, but if its more power I might consider it, thanks everyone