for a decent but even less expensive method, buy a gt40 valve kit on Ebay, next, have a machine shop professionally shave your block( raises compression a bit and costs a good $200) next get a non roller cam that will work with a stock valve train, i reccomend crower(might be because they're based where i live) you can get a good ammount of HP and torque gain, with an AOD you'll want to get a high RPM shifting torque converter if you want to smoke the tires(if it shifts too early you'll most likely grip too quick) all these ideas i gave you will probably cost about $1000 plus you can always add on a few more things, such as better pistons, or maybe even a supercharger, but watch your compression levels, i hate to see superchargers take flight