I have a set of them on my 61 and like them very much. I like that when painted, they look more or less original. But, with the performance of decent flowing aluminum head. Being able to run fairly high compression(10.9:1, 215psi cranking) and full timing (15 initial, 36 total) with no knocking, is sweet. Car has great low end torque, even with a moderate cam. I especially like that the valve cover rails are a 1/4” higher than the stock heads. It gave me plenty of room for roller rockers under the stock aluminum valve covers. Probably a little less likely to leak too.