Sounds like good old hot rodding to me, Keith, I'd go for it. Besides, Jesel is really good stuff. On the pushrod holes, they are sized so that a 3/4" diameter thinwall aluminum tube can be squashed flat and pushed in there. I don't sell those tubes, but they would be easy enough to make up. If I remachined the holes, you could make up the tubes and put them in place, then fill the gap between the tubes and the port with epoxy, and I think that would work.