[V8] heat and smell source?

[QuickAudi at aol.com]

Well, here's one for ya.  After having my rack and pump rebuilt/replaced, I now have some new problems.  I have a tremendous heat source coming from the firewall - feels like walking into a hot breeze - while driving.  This only occurs after several minutes at speed, and it never goes away.  Opening the windows or running the A/C obviously is a temp solution.  I know that I dumped a lot of pentosin on the tranny/exhaust, but shouldn't it have all been burnt off by now?
Secondly, since I had to run my car on four cylinders, I think my O2 sensor is toast.  My gas mileage is steadily decreasing, so I'll do the four wire one soon.  However, when I increase speed (downshift usually necessary), I get a whiff of gas/oil, like it's a mixture of the two.  It usually is a pretty constant smell until I cease my acceleration.  I don't smell it when accelerating around town, just at cruising speeds.
Please, all ideas are welcome.  I will have a lot of time to try them out.


Joel
'90 V8q
'86 5kcstq