They are different, the dizzy worked fine when it was in the celica, it wouldnt work with the truck intake though, I think its because in 83 they had early fuel injection and the dizzy might be controlled by a computer in that year, and my 81 doesnt have 1. Im sure they do work, but not if everything from the original engine is there. I dunno, I know it ran the celica, but wouldnt run my truck.