<VV> idle question 2

[judynrandy at comcast.net]

I have more info on the poor idle situation with the '60 w/ '64'110(with headers)/4spd.  I don't have any vacuum leaks.  The vacuum advance worked like the ones on the 
other 2 Corvairs I have.  I tried the known good carbs off of my 110 in the '63 ragtop. (The first carbs had 51 jets and the known good ones had 50's) 
 The idle smoothed out for the most part.  Ah ha!  A clue.  Then, when I took it out for a test drive, it acted the same as with the other carbs.  When accelerating slowly, they work ok.  BUT when you go around a corner and hit the gas to "jack rabbit start", it coughs and sputters and pops all over the place.  BUT, when you take your foot off of the gas and just gradually feather in the pedal it runs just fine.  If you accelerate slowly and smoothly you can cruise down the local interstate at 65 or 70 with no trouble. 
Now, at a cruise-in the other night I was sharing all this with a friend.  I told him there is nothing left to check or change but the fuel pump and carb jets.  But, if it 
was the fuel pump, how could I cruise down the interstate at 70 with no problems?  I asked him if he knew of a way to tell if your carb jets were to small.  He said 
yes.  Somehow block the chokes half closed and see how it runs.  
     Well, tonight I had to move the car across the driveway.  The engine was stone cold not having been run in a week.  Imagine my surprise when I started it (carbs with 
51 jets and the chokes closed) the CAR IDLED PERFECTLY!!!!!!!!!!!!!  Smooth as silk.  Then, as it warmed up and the chokes opened, back to the same crap.  Probably the same thing that happened with the other (50 jet) carbs 
My second question is this:  This sure does point to the jets being too small, right?  Sounds logical to me.  I thought about putting in #53's.  I saw something in the 
Clark's catalogue about using jets a size bigger because of today's crappy gas.  I only want to do this job once, so any and all thoughts and opinions welcome. 
Thanx. 
  
Randy (Cap'n) Hook 
'60 700 4dr '64'110/4spd 
'63 ragtop 110/pg 
'65 Monza 4dr 84/pg