I was working on my blazer when my next door neighbour came over to talk and was surprised when he said that he had a tpi system that i might be interested in. Turns out its from a 305 later 80s camero and its the full tpi system minus the harness but has 3 computers to work with. He recomends that it should be rebuilt though and offers it to me for $100 canadian. So i guess my question is will this work and fit onto my rebuilt 355 in my 89 blazer that already has TBI ??? Also how much would i really be looking at rebuilding it ??? can i do this myself to save on some $$$ anyways i guess now i have to start to call around and see how much it would take to rebuild it and get a harness for it.