Quadrajet
Quadrajunk, Quadrareject, are names people used to call them back in the day. They were maliagned for their many problems. I have rebuilt a blue million of them, and I liked every one of them. Also ran few in class racing.
Get the exact same Rochester number as listed. It will have the proper throttle linkage, choke style, and jetting. Most Chevys had the same linkage, but there are 3 choke styles and many jetting combinations.
The primary side has replaceble jets and metering rods. The secondary has fixed orifices and replaceable rods with a lettered hanger for fine adjustments.
Numbers were like 7029203
702 is the series, also 705, 708, 1705, 1708
9 is the year 1969
203 is the number for the exact engine combination. This is the one that will get you the right fuel metering set up for your stock engine.
They are easy to rebuild once you see someone else do it. I have seen lots of bent metering rods on ones 1st timers tryed.