Well that was terrible....I am going to order another set of lines....I got these to work after a ludicrous amount of effort. On top of everything else the reason I was screwing around with the center carb was to use a different power valve as I had more vacuum than I initially thought when I was adjusting the mixture screws (which worked before)...but in the course of events I backfired like a shot gun and think I killed the new one....as now I can close the mixture screws and it still runs....really running rich...very frustrated as I am likely my own worst enemy