They do make kits for doing front disc or power front disc. Not too hard to do. I agree with Carl about your 70 350. Any 350, pre 1973, is non smog era and is probably more powerful that a 73-upwards. Anyway they are the engines I like. Sounds like you have the very common TH350 trans also. Nothing wrong with that either, What is your specific complaint? You can get more HP and reliability with headers, good carb, HEI, and all the new tune up stuff as Carl says. To get more, you have to get inside the engine. I don't recommend that if it does not smoke or leak and has good compression. A 3/4 T long bed is not exactly a dragster platform. Also a rear end ratio change is possible. You should be able to cruise nicely with what you have, refreshed.
