Never heard of Conley pump, but as the name implies, a pump is different from a pressure system which the Cline is. The Cline uses crank case pressure off a tap you must install in the backplate. It will only feed fuel if the carb is "asking" for fuel, with the engine off, the carb can be full open & it won't feed any fuel even if the tank is still pressurized. Tank placement/fuel line runs don't matter with the Cline and invert mounted engines. I,ve used a Cline on .40 size up to OS160 without a problem.
I hope my Showtime doesnt weigh 9.5lbs, might be too much for the Moki 135 to hover on. I had it in a 8.5lb U-Can-Do and that was perfect.