HP/Max Wedge Manifolds vs Header Packaging/Design

I am a while from doing headers but I was studying the max wedge variants and the HP manifolds last night. The Max wedge comes too far behind the cyl head and I am pretty sure will foul on the firewall/blower motor in an A body, but that doesn't mean that you couldn't do a max wedge style that drops just in front of the rear most exhaust port. I also found the max wedge stage 3 manifolds/headers they were a tri-Y design from the factory so maybe that is the key?

426 Max Wedge.JPG

max wedge 3 manifold.JPG