It's not the computer one, but I have no idea what this is because I can't find info on it, the manual it decodes to doesn't look like this one. ...
You're right - that's not the 'computer' controller E
4ME type introducted on many 80 California sold cars and light trucks
It's a pretty rare variant used in 79 and 80 California sold trucks and on some other special applications.
The model type is M
4ME - it has some of the provisions used on the later "E4" series, but it doesn't use any of the electrically controlled systems - like the fuel rate control, enrichment solenoid and others.
It was introduced to replace the 60 & 70's 4M/4MV/4MC types.
(note: for future reference, 4M = Manual Choke / 4MV = Remote mounted [also called 'Divorced'
] auto choke / 4MC = carb. body mounted [integral
] choke system)
The Idle Screws originally were sealed with factory installed 'plugs' over them.
Someone busted (by the looks in the picture) them out, rather than following GM's procedure for removing them ...
The Screws themselves are a special drive type (inverted "clutch" ) to prevent 'Shadetree' types from messing with the factory idle settings and renduring the emmissions out of compliance.
You can make a home-made tool for turning/tuning them out of an 1/8~3/16" piece of (soft) copper or aluminum tubing @ 2~3" long - use the "Tang" end of a file (the tapered end that goes into the handle) and shove it into the end of the soft tubing, it may be necessary to hold the tubing in the vise and pound the file in a little with a small hammer. Once you've got the tang into the tubing @1/4" or so, squeeze (or hammer) the sides of the tubing closed on the tang to form an internal shape that fits over the screw end - viola, you now can adjust them ...
The 'Tool Trucks' also sell a socket to fit them.
There's really nothing wrong with that carb as long as it's well built, jetted/rodded/assembled correctly and is adjusted/tuned right.
It's not miss-matched to your engine size wise and can easily deliver the amount of air/fuel needed for good performance if properly built and tuned.
Rochester carb.s will deliever excellent performance in most applications - just takes a little extra time to get to know and love them
Hope this helps.