Something isn't adding up about the original poster's numbers,. Forget the piston stop for a minute, just put a long 3/8" extension down the #1 hole, and convince yourself where TRUE TDC is. Make a mark on the pulley halfway between where the extension starts to go down on either side of TDC.
I plan on doing exactly this. I will compare it to stock timing marks and let everyone know what I find.
Also, it turns out I misinterpreted the leakdown reading on the Longacre gauge. My air tank bled down below 100 psi and I did what I thought was some correct math to get the leakdown numbers. So, after contacting Longacre, they gave me the low down. I posted their response in quotes below. Using their calculation method, my numbers would be:
Cylinder 1 = 25 %
Cylinder 2 = 19 %
Cylinder 3 = 8 %
Cylinder 4 = 33 %
Still crappy, but a little bit better.
"The % leak down IS closely related to the input pressure. 100 psi input is
the standard. If someone uses less than 100 psi - for example 90 psi - he
will need to use the ratio of 100 to his pressure x the displayed leak down
-
ie: 90 / 100 = .90 x 14% = 12.6%.
The pressure should not be much below 100 as air flow will be different and
affect the leak down. If someone were to use a much lower pressure, say 60
psi, the % gauge would need to be recalibrated to that pressure.
As an overview "leak down" is really a relative number and should be used
for comparison of the engine condition over time. It has no real value in
absolute terms"