Dusty,
Your tubes look like the 1/2" malleable metal tubes on one of my engines. I use same sized 1/2" copper tubing on another engine.
Did you adjust your timing and carb mixture to maximum vacuum, using a vacuum gauge?
What size engine are you working with?
A Zenith carb from a 228 would be significantly different from a 270 or a 302 (and maybe even a carb from a 248 would be too much carb).
