Thanks for all the info here.
I determined the high current draw by measuring the voltage on the firewall solenoid +12V switch terminal. It dropped to 7Vdc when switched while the main battery was at 12.9Vdc.
I haven't pulled Fuse #10 but will try that today and report back.
I'm using the MSD ready to run distributor and coil, so the ballast resistor is eliminated. I do have the pink wire from the old ballast resistor connected to the (+) side of the coil. Maybe this is one issue? However, when the car does start 50% of the time it appears to be running just fine.
I also replaced the OE firewall solenoid with one from the local auto parts store. I could reinstall the OE Solenoid and see if that changes anything.
I should have mentioned I have the dash out since I'm updating the entire car where I can. I have check the ZF Ground Strap and that is good but I'm not sure where the dash ground strap is and I bet that is not connected since I pulled everything out during the original tear down.
Any ideas on where the dash ground strap would be?
Thanks,
John