Are you saying that the 81 diplomate manifolds fit into the A body without issues. I'm about to drop the same motor into my 68 and wasn't sure about cleanaces. That would make thing s little easier
Yep it fit great in my 75 scamp with power steering and a 4 speed, so it should work fine in a 68 since the frame rails are the same compared to the pre 67. I had to modify the head pipe a bit because the outlets are not in the exact same place