'Match Race 1969' 440 'Cuda vs 440 'Six-Barrel' Road Runner

Plymouth should have put six packs on the 440 in the barracuda. Hmmm... That is why I put a 440+6 in my 383-S Barracuda. Rumor has it my engine came from a roadrunner.

I read a long time ago that very early six pack 440s had the standard rods and therefore didn't need the thicker dampner. Anyone know this for sure.?