Cheap 318 performance mods.

I’m new to the Mopar world and was seeking some advice. I bought a 1975 Duster body and a low mileage 318/727 out of a 1977 campervan for it. I was looking for some info on cheap, easy mods to make it run better. I have a set of long tube headers and was considering swapping heads to the newer 302 style 318 head and a thinner head gasket. I planned on using an aluminum intake and 4bbl carb but don’t know what the best intake to use is. Also thought about changing camshafts and wanted some feedback on what would be a good choice. I’d like to stick with the stock torque converter and I’m planning on running a 3.23 rear.