rklessdriver wrote:
I'm not going to tell you tuner how to tune but....

Cam surge at low RPM with part throttle is probably a bit too much ignition/timing advance.

The smell at idle is from the camshaft's overlap where both valves are open and raw fuel from the intake cycle is pulled out of the cyl and thru the exhaust valve before it closes completely.... essentially unburned fuel entering the exhaust system. He should be able to pull some injector pulse at idle to clean it up a bunch.

Speed Density cars are tricky to get right at idle and it takes some time and talent as a tuner.

Again excessively rough idle is too much ignition timing advance. The GM Hot Cam should only have a slight lope (if you could even call it that) at 800RPM.... at a true 600RPM it'd sound like it's got some RUMP, RUMP but I don't know for sure that one would idle down that low without stalling.
Will