Are you opposed to aluminum heads painted the factory color? If not ported heads will work. That with a decent cam, it would easily do it in a 360. Add on? Stroker crank would even be better. Headers would help as well but may not fit the look you want. I have a 360 4 speed in my Challenger. Except for headers, valve covers, and air cleaner it looks stock. It runs easy high 12s with a 3.55 gear and sticky radials. Ported 360 heads, 220@.050 hyd roller, 9.0-1 compression. It runs fine on 87 octane.
Doug