Machine Shop Did not Shim Valve Springs

Sure you could use adjustable rockers but that would be just a bandaid . Cutting the valve stems could result int the rocker arm hitting some of the valve spring retainers. Sorry for the bad news but the shop you used Fudged your heads up. Go have seats installed and buy new valves. Don't use that machine shop to do it.
Maybe you missed it in post above, I am using new valves (photo #2) and 1965 274 iron ductile adjustable rocker arms (photo #3). I just noticed the exhaust valves have different spring installed heights than the intakes. The machine noted measurements of spring installed height of one intake and two exhaust as follows : In 1.623 and ex 1.174 & 1.769.
It seems the grooves for the locks are manufactured in a different location on the exhaust stem and the intake stem and/or the tips have been been ground down on the exhaust valves (I see a blue coloration on the tip of one exhaust valve and I see what appears to be slight wear marks on two edges of the exhaust valve tips: see photo #1).

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