LA head question.

If you read the MP engine book, Larry Shepard talks about the early 70s heads such as the J heads and the like. He said they were swirl port heads long before any were advertised as such. I don't think there's a real big difference between the early and late heads. They are all open chamber (except the 302 and magnum) they all had 1.88 intake valves (except the earlier 340 heads and the 318 heads). The ports look the same to the naked eye. I say if the heads you have Adam are open chamber with the 1.88 intake valve, they are good as any of the rest. Probably a good head.