I have a permanent scaley classic track. Copper taped the slots no power taps, lane length is 47 feet with two longest straights at 7,5 feet each. The cars are a mix of scaley, ninco, spirit, fly, pro slot, slot it and nsr.
The nsr and slot it are two fast for the track. The best performers for the lay out is ninco 1, slow but with almost no deslots.