We run the int clearance down to .040 on all our high compression stuff to keep from loosing c.c. and reduce the dome size. on the ex with .0765 you will get into trouble.As Ed said .100 is bare minimum with .125 preferred.
We are a W.D. for J-E and they are 3 weeks out but they have an expedited service if $$$ don't count. 7 working days is 25% more 5 working days is 40% more or 3 working days is 50% more.Bill