hey guys, bear with me. i am new at this truck stuff. i"ve got an "88 gnc sierra sle, two door standard cab, stepside short bed. it was originally 305ci, th400, 3.42 posi 10 bolt. now it has gm crate 350ci, with about 60,000 miles on this engine. there is 200,000 miles on truck. trans is rebuilt...