1972 Dodge Colt

I didn't measure both side, I will tomorrow to see if it's an angle mill.
Head bolt bosses are not milled, so I doubt it's angle milled.

It was on a Valiant that ran in the 11's so it's got some provenance.

I cleaned all the paint off and de-burred all the boogers.

I called Manley, they can't ID the valves.
I called Total Seal, they are going to quote a set of rings.