Welcome to the Team! I'd probably put in a good 10W30 weight oil, if I couldn't ask the previous owner what they used.
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Im going to guess the valve seals are dried up pretty badly after sitting that long. Be prepared for it to smoke on start up. If so, arrange to get the seals replaced.
Otherwise a good 10w-30 oil will work fine. If the engine isnt worn out, even a good synthetic will work fine. Just dont over rev while the oil is getting to know every nook and cranny.
Click..is Jim..former owner of a 69RS-LM1 350/255 - 700r
"There will come a time when you believe everything is finished,
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the car actually is running just fine, burnin a lil bit of oil though, what i meant to say is that the engine was REBUILT in 1998, and the previous owner was a complete moron, he wouldnt know what kind of car it was if it werent for the 'BY CHEVROLET' on the trunklid.
its actually a pretty nice lil beast, edelbrock aluminum performer rpm heads, racing cam, 3.37 10 bolt posi, msd ignition, thing ruins tires quite nicely