Thanks for the replies.
My tri-y headers are ceramic coated, although several years old. The fan controller does run the fan 30 seconds after shutoff and I can adjust it to come on at any temp. I am going to play with running more.
I don't think it is just the fan, but the fan/shroud combo. It is shallow mount fan that is very close to the radiator, I believe it is 16 inches in diameter and the shroud completely blocks off all airflow except for that 16 inch hole. So my theory is, while this is great design for cooling the radiator it severely limits underhood airflow even while cruising.
I've got the larger radiator, so I believe my fan/clutch combo will be too long.
When I hit the different engine components with my IR gun they seem reasonable though. Carb bowls are around 140d (they were 157d before the phenolic spacer). Headers are around 215d, so the ceramic must still be ok.
The other thing I am also looking at is fuel. I still have some winter 93 in the tank... I may need more octane.
My symptoms are not severe, the car will start up after sitting and heat soaking. It does idle a bit rough for about the first five minutes of a hot restart, then it is ok. I do feel like I am a bit down on performance though. I've got a clear gas fuel filter right before the carb inlet. When hot, it looks like there is barely any fuel in the filter, but the bowls seem to be at the right level. When cold, that fuel filter is full.
The car is being used in a wedding this weekend, which will require me driving it about 1.5 hours away, so I am a bit paranoid.