I am looking at some HP exhaust manifolds at a local mans barn collection of Mopar parts. He has many sets of HP manifolds but I do not know the ones that will fit my c body. Does anyone have the numbers and it looks like these will bolt up to the existing exhaust pipes without mods, but not sure. Your help is always appreciated.
Since there was no 383HP in '66, you're not going to find one designed for your car. Plus I don't know what you're trying to fit around or attach to. Measurement, trial and error.