Intermittent slow crank when coil wire is plugged in to the dist

Using a lot of initial timing is the usual cause. Removing the ign, removes the load, & so the engine cranks faster
Fixes:
- check all starter connections
- use heavier starter cables
- get a starter that produces 3+ hp [ MSD dyna force ]
- use a switch to disable ign while cranking, then switch in ign once engine is cranking