Better Torque From A 318

I don't have a car at this time. I'm researching ways to improve both the torque and throttle response of a 318. I've always liked learning about ways to improve a engines performance. I've read that short duration cams are one way, but what about cylinder heads, what runner size, valve sizes to use? Compression ratio, open or closed chamber cylinder heads? Header tube size and exhaust pipe diameter. Ignition timing. I saw a couple of threads earlier on the 318 but I didn't want to hijack another person's thread. I'm working on being more open minded on things and not trying to come off as a expert on anything. I really hate that I missed out on the 1972 dart, but I'm looking steady and looking farther out. Thanks everybody.