Those were the hoses that feed vacuum to the OEM petcock, the other was a vent hose.
On mine I removed them from the other end and then either capped or plugged where they came off of.
If you don't put on the Dan Marc solenoid, make DAMN sure ya turn the gas off whenever you turn the motor off. If you don't you stand a very good chance of filling a few cylinders with GAS. NOT good on starter gears.
It is commonly called Hydro Lock.
Do you have a link for the solinoid RJ? I'm in the process of replacing a motor due to Hydro Lock and would rather not repeat the process. Already have the Pingel petcock.