MGB belt tightness

[dave houser <mgs4dave@tampabay.rr.com>]

Listers,
For those who have added A/C to their engines, how tight are you making 
the belts between the compressor and alternator, and compressor and crank?
Is it tighter or the normal 3/4" play between belts? I've developed a 
squeak when I turn the A/C on and when I take off from a light, a belt 
squeals and I'm wondering if I have it too tight( I'm using a bar to 
lever the alternator up before I tighten things up).
TIA,
Dave Houser