Intake runner length is measured below the carb Hilborn Injection uses injector length to tune airflow deficiencies due to irregular intake runner lengths.... long ones go on the short runners to SLOW the airflow

If anything make different length heat dissipating carb sleeves (installed below the carb) different lengths, that would allow a usable tuning difference.

We're dealing with ultra high RPM "diesels" not a std 2 stroke gasoline engine and full scale automotive race engine. Dynamics that are present in our R/C engines are not present in full scale. I worked for a nationally renoun cylinder head builder here in town for 8 years (contracts included Yates and Hendricks)..... flowbench and dyno is all we did