I recently blew my stock motor playing in the sand for too long and found a 90k mile junkyard motor still in its original pathy that had been rolled, the yard mechanic pulled the motor for me and I swapped it in, everything seemed to bolt up fine except I’m not getting any spark, I’ve checked voltage through to my distributor cap and it’s showing 9 volts coming through the contact on the inside of the cap, plugs and wires are all fairly new so it doesn’t make sense why it won’t spark, when I bought the motor the mechanic started it up still in the car and it ran great, any help is much appreciated!