[6pack] vacuum leaks

[oliver]

hi, all.

1972 tr6, triple carb, gp3 cam, shaved head, etc.

my mechanic tells me from the symptoms - idles sometimes at 1800, sometimes
800 or lower, that I have a vacuum leak.

is there a good way to trace that down?  the spare dizzy is in the car right
now; it has the vacuum advance (and points).  the rebuilt one is ready to go
(pertronix, recurved, no vacuum advance, etc).  follow up question - should I
put that in first?  and what do I do with the vacuum line?

thanks!