helicoil in heads

Wow you are lucky to have had them given to you. I just saw a set sell for $2000 awhile back on E-bay. I have to say that it surprises me to see the 360 on them since 360's didn't come out until 71 and the TA head was only made in 70. All the 915's I've seen have 360 cast onto them even when used on 340's I guess because the 915 casting was originally designed for the 360 engine. I have never actually seen a set of TA heads in person, only pics on the web, and assumed they would have 340 on them. Guess Ma Mopar used all the same casting stamps on all 915 heads. The tell tale sign of them being TA heads is the offset rockers and the pushrods don't go through the edge of the intake runner, their offset to clear it.