In my area every supplier pulls the base gas from the same pipe. They may or may not add addatives after loading the truck.
The terminal is in Dagge,ca
Kinder Morgan Terminal
https://share.google/fJZ08vlqfXHmwGN8W
That era of SBC had cam problems. If it has not gone flat yet it's probably going to be ok. 1979 was not known as a high performance era. The 882 heads are low compression and don't flow all that good.
The valves springs are not that stiff.
Hardly a high performance engine. I would run...