As I have noted on several occasions in the forum, I took out an '85 4100 (the fourth in that convertible) and substituted a 2 barrel Olds small block and YES --- the 4100 distributor does fit the OLDS--- the computer does modulate to several engine management systems, and ALL of the control head functions on the dash DO WORK--- including the A/C, the CRUISE control, and other digital displays.