[QUOTE]Originally posted by 68Gem
[B]I have a '68 GMC pick up with a stock 327, topped with its orignal quadrajet. I am building it to be a daily driver so I want as much gas mileage as possible.

What is going on here? I just went outside to see if it was a full moon or something?
This must just be my night to disagree.The man just said he has a bone stock 327 and most of you are suggesting carbs. big enough for a 454.
A 1965 Corvette 327 -350 hp had 11 to 1 compression, dome pistons,461 heads, 202/160 valves,3in.center dump manifolds,and a high performance hydraulic cam and alumn.intake
Guess what??? It had a holley carb.--less than 600cfm. if my memory serves me correctly it was 565cfm.
68 Gem. if you want a little more performance put a mild cam in it comporable to the original 327-350hp cam or certainly no bigger than a 268 comp. cam. use your same carb or no bigger than a 600 cfm.
Summit and Jegs both sell matched sets of Cam, lifters,intake(with or without carb) They are priced pretty reasonable.
Remember with a stock 327 You don't want to go too big. In Your case bigger is NOT better.