Howdy All:
Chicken- The Autolite 1100 you want will be from a '68 or '69 170/200. These are the only years of an 1100 without a SCV. Note that they are also down on flow- rated at 150 cfm- which should be fine for your 170. You didn't say whether your trans was an auto or manual, but some reference # are- '68 & '69- Manual- C8OF-A, Auto- C8OF-B.
These carbs will work best with a distributor from '68 to '73. A distributor from these years will have points, centrifugal and vacuum advance.
These pieces should be a direct swap on '65 and later 170s.
Also note the the Load-a-Matic carb/distributor system is really quite a good system so long as it is clean and working as designed. A good cleaning & lube, new vacuum hoses, and a good tune up can do wonders for a troublesome system. The Autolite 1100 is not "a piece of Junk"! It is just misunderstood. It is relatively simple, cannot stand dirt and gunk and needs to be rebuilt every few years. A rebuild kit supplies a new Spark Control Valve. A rebuild kit is less than $20.00. A new carb will be more than $70.00. You do the math.
If you do need to replace the sotck carb, consider moving up to an Autolite 1100 for a 200 for your year vehicle, for a significant increase in performance. The 200 carb is rated at 185 CFM.
Mugsy- the correct carb for a '68 is an Autolite 1100, not a Carter YF. Please check to verify. The Carter YF did not appear until 1970. It will have a cable throttle linkage, a different air cleaner and fuel lines.
Adios, David