<VV> Single Carburetor

[John Ingram]

I have a 65 110 that I have rigged with a single Rochester 2 barrel  
Carb.  Runs fine, idles fine, the problem is the engine doesn't have  
much low end torque, once I'm moving along it is okay but off the  
line I need to keep the revs up.  I think the drop in vacuum from a  
carb that may be too big is throwing off the timing, the distributer  
vacuum retards the timing when I press on the gas to start out.  Does  
anyone have experience with these single carb applications?  any ideas?

Thank you,
John I.