Replace the rubbers in the diaphragm housings. SOP on any overhaul of these carbs. You might also consider changing the springs. I couldn't give you a suggestion on color(rate of opening) witout knowing more about the build. If you want to get fancy with tuning, you can drill and tap the kill bleed hole to accept a Holley adjustable air bleed screw. Then you can really play with the secondary opening. If it's a pretty much stock build, I might just opt for yellow or purple springs.
If you are careful, you can unscrew those throttle blades and reuse the screws. Don't do anything to them first. Just find a screwdriver that fits the head real well and take out the screws-they will "unstake" themselves as you wind them out. When you reinstall the screws, just re-stake them from the backside. A little red loctite on the threads works well here too for extra insurance. Make sure that when you go to stake the screws, you "back up" the shaft from the opposite side to avoid any damage to the shaft. It doesn't take much to hurt those, but if you are careful, you can do it successfully. Always check the fitment of the throttle plate to bores as you do this as there is a little bit of float with these and you have to find the spot where they dont bind up befre you lock them down tight.
The bowl you have is probably off a Chevrolet. They were on the drivers side.
MB
