my brother bought a used set at Monster Mopar about 4 years ago. B1BA. Unfortunately, at my urging. intake, rockers, ported heads..1200 bucks
i have come to the conclusion they are more trouble than they are worth.
the head itself is “ Bigger” than the rest of the replacement head crowd, and it has a slightly raised exhaust port. In short, headers are an out and out pain in the ***. And don’t even think about them on a 63-66 Abody.
Well done, they are comparable to a well done Eddie type head. Gotta a buddy who runs them on a 3000 pound A body bracket car. Roller cam, etc, etc. typically runs 10.40’s or so.
with the oddities about them, and other offerings out there, they are nothing I would run, unless money forced me to( got them ultra cheap)