MSD problems

Rather than cranking the car endlessly, I would pull the distributor out and spin it by hand while testing for spark. Best test is to remove the cap and run the coil HV output lead directly to a spark plug (tester or real plug, or even short it to gnd). Clamp a timing light over that plug wire and shine it at the reluctor wheel as you spin the distributor. You should see it flash on every tooth. If so, the MSD box is fine and you have other issues. For those trying this w/ points, ground the body of the distributor.

Seach "MAD Bypass" here. If you don't do so, your battery won't charge since you broke the path thru the ammeter, plus your Vreg might not control the alternator so you go "full field", i.e. too high output voltage which is really bad, especially w/ no sink into the battery.