Even after sitting for a few days, I would think there would still be fuel in the bowl(s)...hell, even after weeks. Carb kits don't cost much, and neither do fuel pumps.
Assuming compression is good, ignition is the only other suspect. Plug condition can tell a lot. Points and condenser, if required, and cap, rotor, wires, plugs, timing...you know the drill.
SBC's are easy and cheap.
cm
