Texas - To partially answer your "1" question, I can't say on the "C" an "E" stampings, but to the best of my knowledge the "A28" is likely a casting date code. Check the top side of the head just inside the valve cover gasket rail by the head casting number as there should also be a casting date code there too. They should correspond to each other.

Others should be along to answer your head surface and flywheel questions. wink


~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)