I am building a 400 small block to put in my 72 blazer. I have heads, intake, distributor, TBI, ECM, and wiring harness, accessories, brackets, and serpentine from a 91 chevy 5.7L that I am going to put on the 400 block. The 400 will otherwise be stock. Can anyone give me some insight as to problems I may encounter? I have been told I could run into problems with compression and timing etc. But on the other hand I have been told this is an easy build that will give me gobbs of torque. Any insight would be helpful!