Ignition setup recommendations

Think I found the problem. The top half of the distributor shaft was loose enough it would pop up 3/8” of an inch when you pull the rotor up by hand. It was enough the sensor would trigger under the shutter wheel with the shaft pulled up. I used a meter on the negative coil post to test. I’m guessing this would trip the box while under a hard launch which would then trigger the shift timer since it would think it had infinite RPMs. A soft launch on the return road wouldn’t effect it since the rear tires spin. Normally my 60’ times are in the 1.45 range, so that must’ve been enough g-force to pop the shaft up. That’s my theory anyway. I put the shaft back in, gave it a couple taps down and dimpled the shaft a little from the inside to swell it out to keep the shaft from moving.

Can I wire an MSD distributor to the Mallory box? The instructions insinuate that’s possible.