miker,
I am in Easter Pennsylvania (Amish country! - Lancaster County).  Have access to pure gas (no ethanol) and it tests consistently in the 87-91 Octane range.  I used to put aviation 100LL in the car and everything was perfect!!!  Well, maybe not perfect, but a whole lot better.  Either way, the AvGas is no longer an option.
55blacktie,
I have not seen the email.   Here is the direct address for a resend:  sweeptee@ptd.net
I will take a look at gofastmath.com
The 10.8 was a guess based on the reduction of cc's due to zero decking and milling.  The Jahns pistons are flat top, not domed, so likely not as high as 10.8  Not looking to operate on pump gas (corn syrup) and will avoid it unless on a long trip with no other options.
sweeptee

57 E 'Bird Customized for Glory

Look at this

That FoMoCo engineering drawing for the EDB-6250-D camshaft posted above by Cliff does appear to be the elusive factory high lift camshaft for the Ford Y.  That drawing does confirm that this camshaft is ground on 110° lobe centers (crankshaft degrees) and has 0.290” lobe lift.  Additional deciphering of the numbers finds that it has 232° at 0.050” lifter rise on both the intake and exhaust lobes.  This camshaft is a symmetrical grind where both the intake and exhaust lobes are the same.  By today’s standards, this particular camshaft would still compete nicely with the modern camshaft designs in being a good street cam for spirited performance with just enough lope or sound to let you know that this camshaft is not a stocker.  Here’s a blowup of the numbers portion of that engineering drawing.
 

Lorena, Texas (South of Waco)