They tried all sorts of things to make those little V8 60 HP engines run faster. I think there is a fellow named Bill Jones here in San Antonio that likes to futz around with the midget racers. From what I've read, Tiny Smith had his own shop here in SA. Luling Machine was also mentioned as a shop that was involved but I don't know if the two are the same. That stuff was before my time but the midget racing was pretty popular back then. I've run into several folks that collect that stuff. Tiny's wife was in the obits just a week or so ago but I think he died quite a while back.
Bill Jones probably knows more about that stuff than anyone still alive. I don't know him personally but he might have some ties to the early V8 crowd here in town.
Kerby
PS: The exhaust did exit the heads. They even were a four pipe set up instead of siamese center port. The intake has the water manifold built in since it didn't have water in the heads.