We did our own head work, nothing fancy just a good 3 angle valve job and mild port and polish. The early heads were prone to cracking but GM came up with the angle port heads in 1970 and that seemed to cure the cracking problems. I had a good relationship with Mark Schwein Rusty Jowetts crew chief and he was a great source of information for us. As you probably know they were pretty tight with Penske so he had the inside track on all the latest set up information.
The hot set up for heads in the day came from Valley Head Service in LA, I used them on some customer engines and they worked very well but unfortunately my budget would not allow me to use them myself.
We started out with the factory cam and later we switched over to an aftermarket cam from Engle .........Surprisingly we didn't notice a dramatic improvement in power over the factory cam which was a bit of a surprise . For me the biggest increase in power cam when installed the cross ram manifold in 1970.
When we were out west for the Riverside race I can remember Mark having one of his engines dyno tested at Traco and surprisingly they put out nearly as much power as the engines that they were building for team Penske .
I am pretty sure our headers were Hooker but I think the hot set up would Stahl Headers but again a little to pricey for me.
I will attach a couple of pictures of my 69 restoration project .......... I have had the car in storage for over 30 years, hopefully we will get around to finishing it off soon........Cheers