Vikki - one should start with one of the aftermarket units. Numbers which are applicable to Pontiac are:

9800s (800 CFM) electric choke (smog legal through 1974)
9810s (modification of 9800s to include EGR port)(smog legal through 1974)
4846s, 4846sa (850 CFM manual choke race only)
4847s, 4847sa (1000 CFM manual choke race only)

The 4847s was tested by Pontiac on the RA V engines. The RA V which set the various performance records was using the 4847s.

The 9800s and 9810s will bolt to the Q-Jet intake, linkage will fit from most Pontiac installations. Fuel inlet is in rear (fabricate new fuel line). Original air cleaner may or may not fit, as the TQ has 2 huge bowls, one on either side. Some of the "pancake" wrap-around original air cleaners will hit the bowl unless a 3/8 spacer is placed between carb and air cleaner.

Other TQ's (as far as Pontiac engines) are useful only for spare parts (floats, linkage, etc.).

While the 4846 and 4847 are listed by Carter as being race only, either can be used on a "pro-street" engine with standard transmission. I would never recommend using the 4847 with a dogmatic tranny.

More information about these in Jim Hand's book.

Jon.