What year LA, every one I have took apart most had a one piece thin metal gasket or none at all.
The fel-pro set come with the one piece and three piece.
I always wondered what year used the 3-piece.
I bought the 3-piece exhaust set (6 pieces) for a 68 318 engine, my original in the B'cuda. They are a pain to use unless you have studs. LOL
I decided against using the 318 manifolds and opted for some 92 Dakota manifolds. I had to do a little tweaking but both sides fit.
BTW, that's a really nice looking engine setup you have there, sireland67. You are just basically using the magnum shortblock? The rest is LA?