360la power increase

Assuming you have a numerically lower gear ratio, you could go up to 3.23 or 3.55 and it would help acceleration without even touching the engine.

If that's not something you're interested in, and you simply want to mess with the 360, start with a good 4 barrel intake and carb, headers, dual exhaust. Easy bolt ons to help it breathe, without removing the engine from the vehicle (if it's in there).

If you're pulling the engine, now's the time to think of the camshaft, double roller chain, and you could home port the heads if you're comfortable with that. Thinner head gaskets for a compression bump.