1970 350 quadrajet questions.

[Chris_oz]

Hi all,
My 70 C20, 350, 4speed has recently developed a great love for unleaded. When I first got it, on highway trips keeping it under 60mph I was getting 15mpg with ease.
I have had her parked for a little while and just started driving it again, fresh tank of fuel doing my normal commute, which is a 80-20 split country roads/light urban.
Even driving easy I can literally watch the fuel gauge move.
Last 3 days which is 175 miles has used 21 gallons. It is so rich it makes my eyes hurt.
I pulled the too off the carb and the float was under the fuel level (or just level with the top of it. I weighed the float, it is 14 grams, which is twice as much as the manuals say it should be.

Could it be this simple, would a dead float cause it to be so bad?
It still runs great, plenty of power etc.

I have checked the jets and needles, they are 75 and 39/26 which as the should be.

There is fuel in all the chambers around the float bowl, at 650rpm there is fuel running out of the boosters. Have I just got to replace the float and set the level?

I have a manual but have not played with a quadrajet before.