[Oldsguy]

Addressing the problems you described in order:
In a higher gear slow to pick up, you mean 3rd gear or higher rpm? If higher rpm you might have a vacumm leak causing a lean out on hard acceleration, if in higher gear, I am stumped on that one.
Rich gas smell indicates the carb is probably too rich, have you set the idle mixture screws? and has the car had a tune up (should have asked that first) it needs a tune up if you haven't done it. This will effect a lot of stuff. New points, plugs, condenser, distributor cap and rotor would be a good start, then set the timing with the vacumm advance disconnected for about 12 before TDC, reconnect vacumm advance, adjust the idle to about 1100rpm in park or about 900 in drive. Then set your dwell to about oh, say 32. This is a reflection of your initial point gap setting. Then at a good idle in park set your idle mixture screws ONE AT A TIME turning in slowly about 30 degrees and waiting while listining to idle, when the idle begins to sound like missing and chugging a little then back off that screw a little, then do the other screw. This should help a lot.
As for the four lines and identifying them, I don't remember and would have to take a look. What about the rigid lines in the engine compartment?
Hope this helps. I am just a backyard mechanic and that is a general tune-up I have done for a long time with specs off the top of my head, most are right, but the dwell might be wrong. Good luck