New Baas build coming together..now use the el or ulh ??

I love when a bunch of old parts I have been collecting finally join together to form something that looks to be a MotorSikle This stage gets me daydreaming even more about riding this old bike across the country and now that Im getting close, it consumes my every thought. Maybe ride this one to Born free next summer. 39 frame 47 springer, 48 tanks, 46 tranny..got my wifes stroked 39 el motor or my 40 ulh as options for this one.