Ok I’m getting closer on this. I installed starter while on engine stand. Grounded starter and put power to relay which jumps starter gear out but does not turn the motor. Result with no spacer is it engages and when power is removed it sticks. So my guess not good spacing unless it would jump back after flywheel kicks over. I added one spacer and when power is added jumps out and doesn’t stick when power is removed but if I keep power to it at that point I might be able to measure.