Mopar 340 Heads
If I think I see what I see (What you really need is a part number.) they look like part number P4876624. At 1172.25 each new, $375 for a pair is a steal.
66fs There would be a few good reasons to swap to these heads. Lighter weight, 25lbs. better OOTB flow with smaller valves, 222 cfm @ .600 with 1.92/1.625 valves, ports out better than old iron, 1.6 ratio over the 1.5. This adds lift to the valve and anhair bit more intensity to the cam. The already have it set up for the 3/8 stud. Use cheaper Chevy gear.
But be careful of this aluminum Magnum heads super small 53 cc chamber!
These heads are used in the crate engine program. They made decent power for a stock port head.m
The draw back is swapping over to a Magnum top set up and swapping oil through lifters and pushrods along with the top end and building up the bare heads is a lot to do. You gotta want it.