Oil For Old Pontiac

Hello, I'm going to try to get a neighbors car running for her (and maybe even buy it from her), it is a '64 Pontiac with a 389 that hasn't run in 6 or 7 years, and I do not know the condition of the engine. The car was restored in the early to mid-'90s and is in very good condition, but obviously can't see what the inside of the engine looks like. I'm going to change the oil and was thinking that a 5-w30 dino oil would be sufficient, what do you guys think? Thanks, Adam.
What model is that Pontiac? Love them old pontiacs, i had a 67 lemans when i was in high school.
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