I have a motor out of an old mustang bout 7years old been sitting up have now put the motor in a 92gt. Motor has about 30000 miles on it it has been bored to a 306 has the b303, windsor jr. heads, 1.72s, and gt40 intake with 70mm tb also long tubes and 24lb injectors. I cant remember the compression ratio of the car I must be getting old. My question is what would be the point at which you would not run a supercharger? Also did a compression test did not take all the plugs out but on the 1,3, and 5 cylinders it was 120 and the engine was not real warm either thanks in advance!!