you could go with plus, but the engine will do some crazy stuff w/o it most of the time, you should just go with premium or if you wanna save $$$$ then you can just pick up and pour in a can-o-octane booster to make the fuel the same octane as premium...
Googled it and it looks like a nice ride,
i'd put this on it though

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-Old ride-82 Luv diesel 5spd with some upgrades
-Past rides-82 Sierra, 78 Coupe De'Ville, 91 2dr Blazer, 86 RX7, 86 Porsche 944T (rear-ended and totaled)
-Curr. rides- 1970 Ford LTD 4dr, 390 4Bbl, 2nd owner! With a few Extras

00' Civic beater...