Im in the process of swapin out the motor on my 88 gmc heavy half ton, its a 350 5spd. and has a ton of blow by, and leaks about a quart from the main seal every 10min at idle. im looking for a motor for it, and have had no luck with a used tranny, but i need to know if anyone knows if its a four or two bolt main? been a while since i tackled a motor swap. thanks guys.