a angle finder from harbor freight. costs like $6
stick it on the driveshafts, the pinions yokes, and some how you have to figure out how to measure the engine slope. on a auto you just stick it on the pan. but a stick, i have found no place that has the same angle (you may be able to do the harmonic ballancer with the pulley off)
you want the engine slop and the rear yoke to be within 3* to keep it vibration free (with no CV)
the front, you want the pinion angle to be even with the driveshaft. this give you the least amount of angle on the CV and a vibration free operation. but when you put shims in the front, your caster changes which effects steering.