[Snakebit]

Car runs fine, no flat spot if I accelerate taking it easy on the throttle. If I floor it, it gurgles and stumbles and then takes off like a bat out of hell. So I am thinking its the bypass jets in the bottom of fuel bowl. Do I go richer or leaner? The plugs are dark tan. I tried the 120 holders and 65 idles and the plugs were black.

331 small block
40 chokes
120 holder
60 idle jets
f5 emulsion tubes
160 mains
190 airs
50 pump jets
50 bypass jets