I asked about the K&N because it looked like a 14" diameter and I wouldnt have thought an aftermarket air filter base plate would fit on a factory 2 bbl carb.
(The top filter can be hinderence because it can create turbulence.)
One thing to check before all that is whether your car has the OSAC. That really killed part throttle response and is easy to bypass.
Speed is not really an issue with a 2 bbl. Passing power will be better better with a 4 bbl. So if you want to try one, sure.
I agree, the larger the throttle bores, the more difficult it is to tune and respond well. I'm all for used carbs, but that one will be more difficult than a smaller one. Also the 750 is known for coming with a short booster which can result in wacky response.
One thing to be aware of is if the car is equiped with a idle stop solenoid. Take a look at the factory carb and/or shop manual.
This was part of the emissions package too. If it was there, it was there because the timing and fuel mix at idle put a lot of additional heat into the cylinders. The solenoid is the stop for the throttle position while running at idle. When the key off, the solenoid retracts further closing the throttle to prevent dieseling.
Deleting the solenoid (if its there) may then require a little modification of the distributor advance. Tuck that away for when the time comes.
