My 340 in my 66 developed issues :-(

This may not be an option for you but I want to make you aware of my experience. I bought a 68 Barracuda from a fellows widow that passed away. The guy had bought a RMS complete front coil over suspension for it. When I put the 416 stroker in it, I was dreading tackling the TTI headers for it. When I did, I was floored at how the headers just slipped right in! No muss to fuss! Just another option to consider.