The Stovebolt Site Forums The Shop Area General Truck Talk a billion questions for all my new friends.

Production numbers on GMC's are hard to come by. Many of the factory records were destroyed long ago.

You can buy a GMC service manual that is a reprint of the original that will give you answers regarding fuilds. On mine I'm running just the standard stuff you find at the auto parts store. Unless you're just rebuilt the motor you should be fine.

That manual is available from most the vendors that sell stuff for these trucks. You can find Parts Manuals used online and the Chevrolet Assembly Manual, also available in reprint, can be useful too, though it has little Suburban specific information.

You do not need a lead additive for the fuel. If you are rebuilding the head you might consider hardened valve seats, but most guys are running regular unleaded with no discernable ill effects.

For the carb I'd put a wanted ad in the swap meet here, over on OldGMCTrucks.com and watch eBay.

I'm the wrong guy to answer color questions and don't know about the clamshell option. Both my Suburbans have barn doors and I don't care about original colors, so I've paid no attention to that information.