20200614_104000 by [url=https://www.flickr.com/photos/97391199@N06
A 1971 blazer, turned down my sending unit, as I was having incorrect readings on my gauge, G1852 seems to stick in my head, but I could be wrong, if you can't find one at NAPA, he will supply one turned down for your truck.
The flat spark plug shield will clear the sender, but in retrospec, someday , I will replace with the angled one.
After I've completed a couple more heat cycles I'll bend the manifold bolt locking tabs down.
I believe the shields are tapped in the block with 1/4-20 bolts
Check your intake manifold gasket you may have blo cked your cross over port
The Eastwood cast iron coating is not holding up to my liking, someday ceramic coating.
Also I'm not fond of the the gasket for the exit port(down pipe) I use a sold sintered piece with a metal sleeve