Performer RPM Cylinder Heads For S/B Chrysler

Thanks for the link, but, it is for taking a six speed manual from a Nissan and that sounds kind of complicated for my purposes. I was thinking of a 1990s era five speed manual from a Mopar. Would it be that much of a challenge? I would have thought that the flexplate from the original drivetrain could be machined to work with a manual trans?