I ordered the Scat TCS-351CP timing chain gear set with built in spacer but it had a couple of problems so I sent it back. The inside diameter of the crank gear was too small and would not fit over my Windsor snout on the stroker 351C crank. also the set had a custom thrust plate with special bearings but did not include the special screws needed to screw on the thrust plate to the block. seems to be some type of production irregularity which made an otherwise quality product useless to me.