Alright, so I have a 1980 toyota pickup and it should have a 20r engine in it, but theres a ? that it could be a 22r. my truck came with a aisan 36 carb on it. which makes me think its a 22r engine, I don't think an aisan 36 would fit a 20r engine intake, it would be way too small. I bought a weber carb conversion for the 20r because that's what I thought I had and the bottom plates were way too big to fit the intake. How can I find out which engine I have?