1974 GMC 4x4 carb issues

[SlackScotty]

I just picked up this 74 GMC 1500K pickup and plenty of issues with the carb. Put another one on it that came with the truck and running a bit better but still problematic. Hoping you guys can assist.

First... I know jack **** about this stuff but learning fast. Bear with me and please... speak to me like I know nothing. Because its true. lol.

I have the carb to the point where it fires up and runs well at idle but when placed in gear it struggles immediately to get out of the gate even at a super slow speed. Any attempts to apply throttle just results in it choking out and sometimes a backfire out the carb. I have seen flames twice now blow out. I have a suspicion about two things... some kind of vacuum issue or the fuel pump is causing too much delivery once its in gear and the truck is moving. Am I even close?

Here are a few pics of the carb. I see some kind of little device that can hold a hose and some wires on one end by the look of it but nothing connected to it. It has two hoses coming out of it on one side to the carb though. Not sure what this does or what should connect to it. Hopefully you pro's can spot things are are familiar with this type of carb and can get me rolling the right direction. What kind of carb is this btw? I ask because again... I'm learning as fast as I can.







Thanks for your time gang.

Scott