Re: Which MSD pro billet should I go for?
I have the GM Performance rebranded, and much cheaper, version of the Pro Billet HEI. It has everything that the MSD has except rev limiter. I limited the vacuum advance to 14 degrees and have the 18 degree bushing and I'll eventually get around to remote mounting the coil. It's a good unit, really needs no upgrades.
My very amateur opinion of CDI boxes is that unless one is required to control nitrous, boost or other stuff I'm not familiar with then they just make your car heavier and your wallet lighter, not to mention add complexity and make troubleshooting more difficult. An HEI module seems to do every bit as good and keeping a spare in the car just in case is cheap insurance. But if you move the coil out of the cap it's been said that the modules last indefinitely.
69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt
76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt