Darlene, Tripower will be fine (at leastmy opinion) you use the mechanical setup that was used on manual transmission cars. The vacuum setup used on automatic transmission cars was a POS in my opinion again. You can adjust the primary (center) car to engage the front and rear carburetors to kick in wherever you want with the mechanical setup.
Also, if you go with tripower go with the 1966 unit over the 1965. Differences are the 66's use the same size carburetors in all three locations, 1965 use a smaller carburetor in the center location. Also 65 used a hot air tube for the choke while 66 uses a divorced choke with a bi-metallic coil spring.
You can only go with 65 or 66 as 64 had a different intake pattern that is not interchangeable. And tripower was not available after 1966 as GM was de-emphasizing multiple carburetion in all car lines except Chevrolet.
On the eight lugs, what is the weight of your Consort? For example, a 66 2+2 (Catalina body) with 421, manual transmission, no A/C, manual steering and brakes but power windows weighed in on a state tested scale with less than a quarter tank of fuel, about five gallons of fuel weighed 4259 lbs. State title showed 4003 lbs. My at present '67 2+2 equipped similary shows a title weight of just under 4000 lbs but that one has never been on a scale since I have had it.
I might have some vehicle weights of 67 model year cars, they were very similar in size. Get that and PM me or if you like I will give you my phone number and we can discuss this further.
I can put in touch with someone "in the business" of performance Pontiac parts that can help you with the tripower, but it will not be a cheap date so to speak. Don't be shocked but you are probably looking in the area of $1500 and up to a restored setup at about $2500.00 I will set you up to talk to him directly without out any middlemen to "step on" the price.
If you are really set on eight lugs, let's talk. I have a set that I would like to sell as I went back to the cast drums on my 67 2+2 with American Torque Thrust wheels as I got tired of the look of the eight lugs. Pics are available, your call.
Whatever you decide I'll try to assist.