Transmission shaft angle question

I just went thru this with my 67 dart, 904 gear vendor OD. My trans is 1.5* down with no shimming 67 OEM style trans mount, 4 cross member bolts tightened with floor jack pushing cross member up. With an 1/8" shim the trans is .5* down, so on my car 1/8" = 1*. My driveshaft 38.5" C to C is 2* down, rear pinion .5* down. Working angles should be less than 3* for long u joint life. I run an adjustable snubber at the track 1/4" from the floor pan.
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