See my update on the C130 for 4 engines. I used individual tanks and treated each engine as individual. The engines were not set with mixture to attempt to get the same speed. I set the throttle barrel full open on each engine with a single servo / engine. Linkage was identical set up for each engine. Then the mixture was set to get reliable performance for the individual engine, this might result in a 400 rpm difference, but I went for reliable flying vs. peak. My reco. is use slightly larger engines so you will have the power. Mine is underpowered built [] as designed but does fly. Jim