Cheaper than dirt 318 build

So I have an 82 dodge d150 that is my daily driver, I don't like the slant in it and where most guys say the more they drive their slants the more they love em, I'm in the opposite boat. I don't like the slant (in this application). It has good power for an almost stock slant and pulls good enough where I could drive it how it is. I've pulled plenty of things with it, which is hard to believe seeing how I have 2.23 gears in the rear and 29 inch tires. I have the opportunity to snag myself a 318 that should run, out of an 85 d150 that's been sitting for a long time for almost nothing. What I'm asking is for a list (with links) to what specific parts would be best for a "cheaper than dirt build" shooting for atleast 300 horses while keeping atleast 15 miles to the gallon "roughly". Remember this is daily driver. Hope to here lots of responses, and I love the slant, just not for this application or vehicle, so no "just keep the slant" remarks please and thank you, I mean it in the nicest way possible. I've already made up my mind.

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Just trying to help. We don't know how much you know or don't. I lost count of how many want to swap a V8 in place of a /6 and don't know the transmissions are different. I'm out.