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I have an awful Carter BBD computer controlled carb on my Jeep. The vaccum diagram is just as complicated as the electrical diagram. Alot of guys end up putting on a Ford Motorcraft 2100 or MC-2150 stand alone carb & still pass emmissions tests. Husquavarna also put some catalytic converters on 2 stroke chain saws. So running a cat with a fairly simple carb is certainly doable.
I would look into some emmissions systems of some very early cat equiped vehicles & see what all was required. Most cats are killed by running rich, the unburned fuel burns at the cat causing the substrate to melt, plugging them up. This robs power & makes the car hiss everytime you hit the gas.
Someone else had mentioned some Clifford Performance products. They specialize in straight 6 parts. They sell cams for torque
A 4.3l v-6 is only slightly larger than the 230 cid 6 that chevy used & may bolt into where the small block v-8 would go. All the modern bits to help with emissions & fuel economy.
Good luck
Don
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