My 340 in my 66 developed issues :-(
The car came out great! I had a couple of issues though... I got it together and drove it a couple of days and it blew the head gasket at nbr 3 cyl into the lifter valley, so it blew white smoke out the left bank when I was leaving Hampton beach
The heads were both milled and the deck was dropped .020 each side... I think what the issue was was I used the cheaper fell pro head gaskets. IDK... That's what I'm thinking anyway..
When I tore it down again and replaced the head gaskets, I used the high performance felpro head gasket p/n 1008
It has a few hundred miles on it now and no issues, I wish I wouldn't have cheaped out and got the other head gaskets...