several voltage regulator burn

On my 66’ I had the same trouble. I bought one from Classic Industries that looked just like all the other factory looking VR’s but the electronics inside seem to handle the alternator better.
SN: the car had a great ground from Battery to the engine, I installed an additional ground wire from fire wall to back of the engine for Ha, ha’s at the same time I installed this last VR.( I did have a triangle of grounds but added an additional block to firewall)
Honestly, it’s been over 1 year (knock on wood) with zero issues.