im building a 4 bolt main 383 for my 89 K5, i allready have the heads, they are iron world sportman 2 for 87& up, i also have a complete tuned port setup out of a 88 5.7 camaro. this setup came with accel throttle body, and aftermarket plenum runners, i also have the ecu and harness. now its time to get the pistons, but i dont know what to get as far as compression because im thinking about getting a vortech supercharger. im not sure how good its going to be in my truck as far as reliability or if its worth the trouble. has anyone have or seen this setup? i just dont want to spend $ for something that may not be worth doing.