Scrub your new motor up nice and clean. Build yourself a little engine run stand. Get the motor on your stand, remove the plugs, hook up a battery to the starter and give it a compression test. If the motor has good compression, give it a tune up, change the oil, hook up a gas can arrangement and get the motor running on the run stand. I have seen run stands made out of wood and metal. If it runs like a sewing machine like you were told, you are off and running. start making up front motor mounts and rear motor mounts and install it.
Taking it apart at this stage will not tell you anything really, except maybe something really obvious and catastrophic.
Last edited by Dragsix; 12/13/2020 10:23 PM.