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I have 452 heads with the roof enlarged out to where they are .005" taller than an Indy 440-2 MW intake port intake. Which is still a shorter opening than a true MW port.
There is physically not enough material in any non MW head to port them out to true MW height or width.
Somewhere on here...
Those valves have a 11/32 stem, so the retainers and keepers need to be of that size.
Keepers: 11/32" Single groove and either 7 or 10 Degree to match the retainer. Normally STD. unless you need to adjust for spring installed height then either -0.050" or +0.050"
Retainer: For 11/32" valve...
I have the broadcast sheet from a 67 Belv II 4-dr that was an extra in one of my cars. Has the H4A interior code and is stamped SILVER SPL at the bottom. Box 649 - Delete Molding has a 9 in it so I am guessing this corresponds to m9 on the fender tag. Never really looked at that before.
I do know without the carpet on the floor and the carpet trim on the console it sticks up quite a bit. If it is sitting right and the holes line up on all 3 brackets you should be ok.
I’m having trouble picturing how those would work on an E-body. I admit, I have almost zero experience with 72-later e-bodies, but didn’t the dual exhaust cars have the same resonator + muffler arrangement as the 70-71s? Here’s a pic from a very low mile survivor 73 340 cuda with the same...