I have a '37 Chevy Coupe, bone stock with 216 and 6 volt system. Runs good & starts good when cold. Starts hard after engine is hot. I installed an 8 volt battery. Starts good cold & starts good hot. Everything seemed fine. I ran it after dark to check the lights. I burnt out the low beams after about 10 minutes. I hit the brights and about 10 minutes later I burnt those too. A couple minutes later I slowed down for a turn and the engine cut out several times when I started to accelerate. Another mile down the road I slowed for another turn and she died. Turns over very well but will not start. I suspect the coil is bad.
Are the head lights and the ignition problem both related the the 8 volt battery? Is the head light problem ralated to the 8 volt battery and the bad coil just a coincidence? Do I need to make any other changes to use the 8 volt battery?

Thanks,
Roger