All mods complete - made up the leads from a set of old LS1 leads I had laying around (coil end) and recrimped onto cut down existing MSD leads with a bit of persuasion - all ohm'd out fine.
Have modified the wiring harness to add the trigger/power/ground for the coils and add in oil pressure & fuel pressure monitoring. Fuel pressure works a treat, oil pressure I won't know until I get it running.
Once I get the spare mallory distributor modified/machined down so it's just a true cam sensor, this will mark the last mod I made to the motor I think