I agree the coil should not be upside down.
Ditto get an electronic voltage regulator.
Are you running a sngle field or dual field alternator??
for giggles swap out the ballast resistor.

it is something simple and you just don't see it...yet


'68 Newport Custom Barge on a Budget!! BOAB
1973 Satellite WAGON! 318- 3 on the tree!!
2008 Chrysler 300c HEMI!