There is no such thing as a Painless V8 conversion into an 86. The first issue is that the radiator sits too far back and you will need to change over to the 4.0 hood and latches etc. and you will need fabrication skills for that alone. New custom radiator too and custom fans etc. And the list goes on. The best conversion to use is the Camaro 3.4L. It is a bolt in and gets you 160 hp in the right years