Recommended Engine Oil ?

[Aubrey N Bruneau]

I'm in the process of getting my old beater ready for Mission later this month. Need to change oil. Been using a zinc fortified 30W ( no longer available ), but I know I don't need that much viscosity in an engine thst doesn't see extended driving, or high temperatures. Even fully warmed up, oil presure at 1200-1300 RPM idle, is 25-30... and goes 70+ over 2500. With the engine cool... like tring to make a fast qualifying pass, my oil pressure at RPM, goes scary high... over 80.
Don't like that.

So, do you guys have a recomendation for oil brand / type, viscosity ?
I have an unusual oil pan on my car. It's actually an over-the-counter GM replacement pan, which has an extra 2 quart capacity ( I run 7 quarts in the 8 quart system ). So, I don't have to worry about running the pan dry.

Just trying to make a few good passes there at sea level !
Hey, bringing a spare rear end pumpkin too !