My understanding is the 051 360 head is a later LA head. Nothing special when it comes to flow or compression. They can be made better, but they will never be great. The heads that should have been on the engine would have been a little better, but I forget the casting number. As far as headers, I could run a stock V8 273 manifold, but I was going to contact Laysons to get a set of their headers. I have heard many bad things about TTI not fitting right and people beating them to fit. And Doug's is a bit expensive for my build. I really don't want to cut up the inner fenders. Just want to save an old wore out Mopar and have some weekend fun with it. I don't even need to win a race. I just want to finally have a V8 60's Mopar that makes me smile when I get in the gas. And maybe run 12.90 in the quarter.