Well - you should get a lot of opinions on this subject.

I set the motor & pinion angles with the car at ride ht.,since it appears that you are not changing the suspension, but only the motor, it should be simple to measure this before you start.

I set the engine to get the carb level(usually 3 degrees down to the rear). I then set the pinion at the same angle (up at the front from horizontal).

Don