I have a 1985 4 door 4X4 1 ton as a parts truck, and I want to pull the motor to build it up to put in the k5 . Well I was wondering if the 1 ton 350's were 4 bolt main or 2. Also could you give me some advice to go about building up a motor for rock crawling and off roadiing:parts to use, things to look out for. I want to go TPI, but if you can convince me otherwise please put your $.2 in. this is my first time building a motor. This is what I had in mind: 383 stroker kit, with TPI, please fill in the blanks.