Hi Matt.
What engine? What year? Manual choke or automatic?
In September I posted lots of information on the Rochester carburetors...emphasize the word lots. If the castings are not straight, I do not believe for a moment your Rochester will ever be worth using and out of 5 I dissected all were warped. I spent a lot of time (and money) showing everyone here how they can be straightened rather simply using a gas grill, 4 screws/nuts, a dial gauge and a piece of 3/8" thick metal. If they're warped, they'll seep fuel at the air horn to bowl mount and you'll also lose vacuum needed to keep the power piston off the power valve ball. There are about half dozen other things that will make trouble for you.
The Carter carburetors were also discussed in September. They're a different design entirely and I believe will work better than the Rochester...if and only if you use the truck frequently. If you drive your truck once every few months, you're going to have trouble with almost any carburetor using today's gasoline. The Carters will suffer cracked and useless accelerator pumps. The Rochesters will suffer stuck and gummed up power pistons and deteriorated and dried out accelerator pumps.
Whatever you do, please don't buy a carb from O'Reilly's, Auto Zone or any of those places. Please go read what I posted. Learn about the animal and then you can deal with it.
