On my K3 with its right hand side petcock with 2 outlets I was able to run 6" and 12" lengths of fuel line from the petcock, over the carb insulators and through the holes in the carb stay plate (holes between carbs 3&4 and 1&2) to the inlet T's. The T's were pointing up at higher than a 45 degree angle, and I was able to get clamps on the hoses.
Hope it helps.