i thought that. put a wanted add on the
UK Mopar forum and ended up with a complete A body 8-3/4 drum to drum with Suregrip 3.23 gears and in a 489 case (though it has still to be fitted to the car) The guy had loads of parts and could build one close to the spec I was looking for. Kept with the small bolt patters as i have a set of 15 inch Rallye wheels to go on as well.
