1969 Dart 340 cam selection help !!!

He likely won't be able to run a 274R cam in California on our 91 pump swill at a true 10.3-10.5:1. I had an ede headed SB quench engine with 10.7 and 8-12* more cam timing and it pinged like a byatch on 91 pump gas. 50/50 mix cured it. It was a mess without the mix. Ended up putting in a cam with 10* more duration, fixed the issue.

I threw out that build because it ran on CA pump gas, sounds nasty while running very well.

Not enough from the OP to make any kind of suggestion on where to go IMO. Very vague. Pick a power output and build to it. Want it to sound nasty, get a cam cut on a 106 centerline. Pump gas is going to be an issue out here.