[blykins]

Jac, if you use a standard base circle cam, there is sufficient clearance. The tightest spot is on the #5 cylinder as you say, but with a big base cam, it's fine. I never take anything for granted though...I checked any way....hahaha

Rick, I really don't see the need in it. For all of my Fords, they get Ford Racing double roller timing sets. IMO, you would never see the difference in anything else. If I need something more "hipo", or if I need something I can adjust almost on the fly, I'll use a Jesel belt drive.

The regular Ford Racing double rollers are about $100, have a buttload of keyways, and come with a thrust plate. Can't beat 'em.