Sounds like you guys are having some fun. And not to but you really need those EGT gauges to get things dialed in. With a V-8, and w/ multiple carbs, that wide-band O2 sensor isn't going to tell you if one bank or the other is lean (unless of course you're running one on each bank). I don't know how many EGT probes you're planning on using, but I would think 1 for each pair of cylinders would be good. I know guys w/ 4-bangers that run one on each hole.