So...any methods for improving compression/quench? Necessary, or not so important? Do Magnums really have 9.1 factory compression? Given the low octane gas we have, it almost seems like you could leave it alone...
You expressed an interest in keeping the cost down, so all of my suggestions are based on that.
Yes 9.1
I run 87 without any problems.
93 gives about the amount of better gas mileage that it costs, so it’s kind of a wash.