I'd say it depends on how much YOU can do, your capabilities, if not much you will pay the piper, keep it simple, 360-383 with good heads,cam, intake, carb and ignition. I'd be embarrassed if it didn't run 12s-13s. 100 hp shot nitrous would be easy to add. Get it running then as time and money allow upgrade the combo. If you can do the work get the Gen lll 5.7-6.1, sky's the limit for that engine. Stock transplant, 5.7 $1800 with fast controller $1300 mated to a 904, mounts, oil pan maybe another $600 you're on your way, use the stock headers. Again upgrade as money comes in. Scrounge around for deals on parts! Don't have to buy new! Get it running and you'll have your money pit. LOL