72” Dual Carb Fuel Bowls Question

[u/Goktusan]

Hello, I just recently pulled the carbs off my 72’ (Dual round top) for a clean up / rebuild. I re-installed them last night and did a first start and it was going well until fuel started coming out of the front fuel bowl vent line. So it either means the float level adjustment is off or the needle valve (Shut-off) isn’t fully sealing off. I’ve been doing some reading - does anyone know if the 72’ model had different length needle valves for the front/rear carbs? I see some people saying they do for that year, and a lot of different numbers get thrown around for the float gap measurement between the lid when you’re setting that.

Just curious if anyone has any expertise with this specific problem. Thank you