Fastrax review and alignment questions for the pros.

If you set the total toe (correctly) with the steering wheel centered in the steering box and the steering wheel is in that same position in a dynamic condition, there is no reason to think about it any more. The only way I know how to find the thrust angle of the car is by measuring individual rear toe and with a computer. I was bottle fed on computer assisted aligners so someone else might help you better than me but the plumb bob aint a bad idea and I have mapped out frames that way but you can't measure datum (height) that way but you can use your sheet metal for that.

You can measure bump steer. Once again, if your car does not exhibit bump steer there is no reason to worry about it. Yes, a longer than the other tie rods can contribute to bump steer but it would have to be a lot and should prove some other severe condition, like... bad rear individual toe.

These old cars are not really that precise nor do they need to be. A lot of what is measurable today is more of a diagnostic procedure to find out what is wrong with newer cars as they are more effected by misalignment.