I put a 87 GN engine in a 2 seat sand rail(dune buggy). Car weight with driver and fuel is 2000lb. I run open exhaust(20" long),TA-60 turbo, 009 inj.,old K-B 9" lock-up,with Riv. 4 speed auto.Currently has Reds 108 chip. I want either 60 or 80 inj., and chip to match. Has Reds X-P pump,hot wired.Will a single pump work on 80 inj? I wonder if a SD chip would be better with open exhaust? I was on your site and saw 60 were out of stock. Please respond when you can. Thank you.Mark.