Stock mopar K ?? If so they are all pretty much all made the same with exception of motor mounts location/configuration. I just converted a 67 slant sux K into a small block V8 k. Not sure about big block ones, however anytime your going to put a big block in an A body, its like stuffing 10 lbs of **** in a 5 lb bag. There is never any room, unless you go Hemi Denny, coilovers, and rack n pinion. Then you got all the room you could ever wish for.