Thanks, guys. Yes, no other changes besides the carb swap.
OK fix surge first and then timing.
I am thinking I will put a weaker spring in the carb piston because that is easy from the top of the carb. If that doesn't help, do the jets.
I will start at 10-15 degrees with the Mopar Perf distributor and see how it goes. There are a lot of hills around here.