Hi Ken

The  HZ crank is as much a  drop in as  any  FOX crank, some cases are  tight  some are  loose  , lapping one in is very little problem if its  needed.
You can use a card  to cut a gasket if you like

Randy

Just an add in here,  the Fox 35ABC piston/liner set is a pretty good upgrade for a good running Fox.  It gets rid of the vibration problems nicely and looks like it will hold up for quite a long time.

If you are taking the motor apart probably the biggest thing to check is that the liner seats evenly on the top of the case.  Without tools the only way to check is to put a bit of lapping compound under the sleeve lip and twist the sleeve around a few times.  Take the sleeve out and clean up the mating surfaces and look for an even gray color all around on the top of the case where the sleeve sits and on the bottom of the lip on the liner.  If you see a few slight high or low spots they can be lapped out.  Worst case is when one side of the sleeve or case is untouched.  That means either the case or the sleeve lip is machined crooked.  At that point, especially if it was a new engine, I'd put it back together and send it back to Fox for a better sleeve/case.