Ignition Switch Changeout

First thing I did was replace the ballast - no help. Would turn over but not fire.
I also think the firewall is not grounded as there were other areas not grounded either.
I'll attempt to ground the firewall to the frame to see if that helps.
The other potential issue are those bulkhead firewall connections.
Was an original 6 cyl automatic and I dropped in a rebuildt 340 & trans, 650 Holly and other chassis improvements
It was all put together in 2010 and has been running great but early this summer - it just decided not to...