71 340 motor with J heads

I know of a set of J heads for cores, dates codes match 0881 - 88th day of 1971.

Owner is in south central PA but he is not on the internet.

Buying cores can be iffy & he knows that. History unknown, 3 valves missing, so he told me $100.00 would take them.

Shipping could be a pain though, where are you located?