318 or 360?

IMO, for cruising around a 5.2 is plenty good enough. It moved my 5000lb 98 Dakota 4x4 without issue and should be pretty spunky in a car 1300 lbs lighter. If budget is an issue, I'd just pick up the best looking, lowest mileage running 5.2 or 5.9 magnum engine out of a wrecked truck, put a Sniper and intake on it and call it good. While it's out you could put a little hotter cam and maybe valve springs in if you were so inclined.