<VV> 140 vs 180

[Stephen Upham]

I've been looking for a sports Corvair to add to the stable while I'm 
working on rebuilding the engine on the '65 sedan.  I want to know what 
the group thinks about the advantages and disadvantages of owning a 180 
vs a 140.  For example, dropping valve seats, ease of tune-up, low 
speed horse power (heard the 180 can be anemic until the boost kicks in 
  :( , ect.    I've seen 140's with a  single carburetor located over 
the blower.  How well do these work, and are there any performance 
gains in hp or significant loss of mpg.

Musing while I await my rebuild replacement cylinders, rings, lifters, 
and gaskets.

Stephen Upham