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I have just done this on a 86 runner. I do not understand why he would want to maintain all of the parts off the 91 of course California has many different laws. There is probably nothing wrong with the 86 parts and all that would be needed is the long block. As for the distributor I was told it had a slightly different timing curve. I am not 100% sure but it doesnt hurt. I am sure the injectors off the turbo might flow a little more but do not have any facts to back it up. Same with the throttle body etc. It would just seem as it should. The first swap I did I put a turbo in a non-turbo 87 truck. It worked great and was pretty easy.As I said on the AFM. if you remove the top cover on the inside you will find a spring held in place by a clip. the turbo will have that spring tighter than a non turbo. Just do not let that spring go., and take a little tension out of it.(mark original location) This works in conjunction with the throttle positioning switch to tell the engine how much air to fuel. You can drive it and you o2 sensor will tell you if you are to rich or lean. You will get a check engine light check the code to find out to rich or lean. It takes some time but works. It is always better to have it rich than lean. Once you can get the light to go off just fine tune by checking the plugs. Or better yet find a AFM off a non turbo truck. I recommend buying a factory service manual from toyota before starting and not a chiltons.
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