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First of all, good luck with the possible buy. Second, the 260 HP GM Goodwrench 350 is a flat tappet cam engine. No provision for a roller like the 87 up engines had. So a roller cam will cost you some big bucks if you decide to go that route.
Most likely, it's a Q-jet. I think some 305's came with 2 barrels but they were used on 3 on the tree low optioned trucks I think. The Q-jet on the 83 will be covered up with hoses and such. It will have a electric choke of course, but it will also have the dual capacity pump system. This consists of a valve in the carb with wires going to a switch mounted in the thermostat housing. This is not a bad thing, but it's not really needed. Just more crap in the way if you ask me. This was used to supply extral fuel to the accelerator during cold operation. I think it was intended on helping with cold running on these smogged to death small blocks.
It could be in good shape, but will most likely need rebuilding. If it has already been rebuilt, then this is usually a bad thing if the rebuilder didn't know what they were doing. It's hard to speculate on something without seeing it first. Don't sweat it though. There are a ton of used Q-jets in the junkyards that you can get for cheap and rebuild if the one on the truck isn't up to par. Of course there is the Edelbrock 1904 Q-jet that is the best route to go, but they are big bucks.
Good luck with everything and let us know how it turns out.
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Mike
1985 Chevy C-10
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