Doing an alignment in the driveway on a 72 scamp

You can do a lot better than that. You can actually MAKE a caster/ camber gauge without much trouble

Some ideas:

http://www.toyheadauto.com/CasterCamberGauge.html

The operating destructions for this type of gauge NOTE You must know the number of degrees change per rotation of the level control knob so figure that out

[ame]http://www.toyheadauto.com/J-pegs/ToolPicsJpegs/CasterCamberInstruc.PDF[/ame]

http://www.instructables.com/id/Hands-free-Camber-Gauge/?ALLSTEPS

Way way over the top

http://www.quadesl.com/miata_alignment.html

But me, I just found some used junk on Craigs

An old Ammco caster/ camber ga that worked fine after some cleanup, adapter clamps for the wheels, turning plates (not shown) and an Ammco toe gauge which may be more trouble than it's worth.