It's easiest to measure without the driveshaft in. Measure the trans angle off the back and measure the pinion on the face of the yoke and add the angles for your pinion angle. Your measured angles of trans 2.5 degrees up and pinion 0.2 degrees up is a pinion angle of 2.7 degrees up without pinion rotation considered. Depending on the state of your leaf springs, the pinion can rotate 2-4 degrees up. I have Caltracs with split mono-leafs on my race car and Calvert said to set the pinion angle at 2 degrees down and it's perfect. It sounds like you need to get your pinion down to about 4.5 degrees so with 2 degrees rotation you will be at 0 degrees under load.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule.
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