Hi Tom,
I have used an MSD 6530 on one of my previous cars.
I didn't have the success I wanted in a few areas.
I have now found a much better system:
https://www.cbperformance.com/Produc...oductCode=2013
Note that is has a 21 x 21 fully programmable table where you set the boundaries of map and rpm. Completely user adjustable, on the fly.
A great product.