Sorry, 974 is in fact a mid-70's casting #, looks like 1976.

Did Direct Connection offer a factory ported iron head? They have a lot of W2 characteristics. Bet they flow pretty well.

I saw a peculiar pair of heads they did on Ebay a few years ago. The way they did the ports, they got huge numbers in the lower lifts but not much past like .550 or so said the accompanying flow chart. Maybe they were for circle track? Don't know but they always stuck in my head for that reason.

Would be cool to see what these look like on a flow bench.