Issues with the voltage regulator and battery terminals. Cleaned the terminals and replaced the VR. Back to normal.
Well, coming back from a rock concert Saturday night my Belvedere ran great. Over an hour drive each way. Hot and Humid. No issues. We got home around 1 AM. Next morning there is a puddle of trans fluid underneath, a big puddle. Trans is shot. Since I was going to pull the motor this winter I've now decided to upgrade both the engine and trans. 273/904 will be gone. I found a place to get a nice rebuild 727 auto and hopefully I'll be looking at a 360 this weekend. Updates to come.
I have a 360. Clean engine. We will go through it but it doesn't look like it will need much. The 273 is ready to come out.