Engine decking issue(help)

I had two sets of heads done by one of my good shops...a pair of Chevy 993's for my kid's modified and a pair of J heads. The Mopar's cost $8.00 more to do than the Brand X.... did exactly the same work... 5 angle, angle mill, bowl blend, stainless valves (2.20/1.60), similar springs and valve seals, etc.

Good parts mostly cost the same... cheap stuff is cheaper for Chevies. Machine work is the same cost.