Lemme guess: B-36 Peacemaker
Now, is that 14lb weight just the airframe, or ready-to-fly? What glow engines was this designed for?
What's the centerline spacing from nacelle to nacelle? This will determine the largest prop you can spin.
Shooting from the hip, I would guess the plane will weigh ~20lb or so fully laden and ready to fly. Bombers don't need a full 100 Watts per pound, but I'd still look at half a dozen 350W power systems, like Jeti Phasor 30/3 on 10 cells and propped for 35 Amps.