Levo-Lon
Guru
I drive a cobra with a 1978 small block Chevy in it.
So far I've spent 12 hours trying to track down a misfire. I WISH I had a computer to tell me what's wrong.
Check the cam on the distributor if you have points on that ..
You can get a build up on one of the cam lobes and a very annoying to find misfire.
Give it a good clean with fine emery and see if its sorted.
Tho it could be a lot of things but that's a free fix