Just one other quick thought on this. You say you're getting a loss or lack of power and exhaust smells rich. Do you also get a mis-fire?
I'm just wondering if you have an ignition fault in there. Check the condition of everything - dizzy cap, rotor arm, HT leads, coil, all connectors (make sure they are clean and tight) and lastly the ignition amplifier. If you decide to replace cap and arm make sure you use only genuine parts - please don't use pattern ignition parts. Check/set ignition timing.
If your ignition amp is on the side of the distributor and it is of any age it may well be that is the problem, they are known to misbehave when hot.
You might also want to think about maybe removing and cleaning the plenum and ram housing, might also be worth cleaning the flame trap and rocker breather as well.
HTH