Hi Jim,
I have no experience with the Colortune, but the Unisyn is very handy.
Listening to the airflow with a length of plastic tubing worked for me
too, but some people don't have the ears for it.  The Unisyn is
virtually idiot-proof.
Don't be afraid of the SU's.  The first mechanical thing I ever did was
rebuild the SU's on my '74.  After paying three different mechanics to
try to get them running right, I bought the Haynes SU manual and did it
myself (I guess those mechanics never read the manual).  They're really
not very complex, and if I can do it, anybody can.  
And my car-nut brothers, who know nothing about LBCs, were quite
impressed that I rebuilt my own carbs - one even brags to his buddies
about it (he he - they have no idea how simple these things are).
-NORY
Don't assume that because you have found one problem, you have found the
ONLY problem.
 '71 5-speed Midget (my new baby) 
 '74 Midget & '71 parts car
 '94 Ford Ranger
 '86 Ford Escort
 '89 Ford Probe
 '96 North American Shepherd
 '94 Tigger Cat/Wheel Chock
Car pages and other stuff:
http://www.geocities.com/SiliconValley/Way/9101
Home Improvement Homepage:
http://www.angelfire.com/ny/nory
NEW Legal / Law Enforcement Page:
http://members.tripod.com/~nory
 
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