yep the tube unbolts and you can run it into the threaded rear port. Then use rubber hose we did, as for the egr, sorry man if I knew you had it still I would have told ya, had the same thing happen to us. edelbrock has an egr kit to relocate it and keep it there, bought our block off from local autozone, had one in stock. You could easily make one.
If I remember right the big fitting on the quadrajet comes out and the tube goes into that fitting, not sure if you need the fitting on the edelbrock or not, it's been awhile. I can look at ours both our in the yard if it don't rain all day and get pics. The one on the monte carlo was quadrajet replacement, and the one in dad's 84 now is on a weiand intake. I just used a threaded barb fitting from my trans cooler kit on the back of it, some teflon tape and rubber hose with clamps. You're gonna need a longer fuel line too. We used an inline filter and rubber hose.
As for the linkage we bought the 2 studs from edelbrock, one for kickdown th350 and 700r4 is the same stud, the throttle is one that has a washer and cotter pin, they are like $5 each. If not you can rig up a small screw for throttle and like 2 nuts, the first has to stay loose to let the cable move, the 2nd nut locks the first in place. Done that many times on the old 76 we had.