You need to be cautions no matter what the driving conditions until you get the coolant leak taken care of. If you suddenly dump a ton of coolant while pounding on it and overheat you could do major damage. Smelling it when stopped only means that you're out running the vapors while the car is moving.. doesn't mean a thing.. other than YOU HAVE A LEAK.
As for the CC, the proper routing is for the purge outlet to run to the upper nipple of the BVSV and then from the lower nipple of the BVSV to the throttle body. Running it directly to the throttle body puts the CC under vacuum all the time which isn't really something you want as it route back to the gas tank (which you don't want under negative pressure as much as you don't want it under positive pressure). The way you have it routed right now is fine for a temporary measure if you BVSV is broken (it's not uncommon for the nipples to break off when they're this old). But it can also contribute to excessive richness in the air to fuel ratio.
With regard to the over heating, you've got a coolant leak, that's a given. You're seeing an increase while stationary due to the missing cowl, another given. One more thing to check is your ignition timing... too much of an advance or too much of a pull and your engine temps can skyrocket.
http://www.cygnusx1.net/Supra/Librar...aspx?S=IG&P=20
A warn timing belt can contribute to improper ignition timing as well, but let's worry about that possibility later.