Alright, I've had a chance to completely remove the intake and exhaust manifold. I removed the secondary butterflies as recommended, threaded the shaft holes, and plugged them.

Everything coming back together, however, during installation, I accidently pulled out the fuel line going into the bottom of the jet on the rear carb. The fuel drained out of the float chamber, then stopped. I figured it would refill when I restarted.

Restart comes, car starts up after a few cranks with full choke. Let it warm up, and start messing around. Engine is extremely rough, like running on 2 cylinders (or one carb). I'm guessing I may have done something more serious. I sat there babying the throttle for 15 minutes, hoping normal fuel flow would resume. Adjusting the jets right now appears to do nothing. Without the choke half way out, the car won't run below 1500 RPM and some petal feathering. I'm currently at 12 flats down. With the choke half way out, it idles, but roughly.

The roughness with or without the choke extends to any RPM; the engine vibrates something fierce, and it feels like when I was running full choke and flooding it. However, leaning out mixture even more doesn't to anything to alleviate the "chug chug chug" I'm getting. Neither does richening it.

What could I have done to my float or something else during reassembly?