I would like to add,
I have a 82 PA and have the 454. My right Manifold Gasket was bad when I bought her so that was the first thing I had fixed. It only lasted a year but they fixed it again under there Warranty.
The second type Gasket they used had a metal Ring around the hole. That was 3 years ago and have not heard it since.
I would also check your Fuel Filters. Mine put us on the side of the road late night on a Sunday in no-mans-land.
There are 3 on mine 2 under the Body (Duel tanks) and the 3rd is on the carb.
I can't tell you how hot it runs by degrees because my gauge only has Cold mark ,halfway mark and HOT. Mine runs at the 1/2 mark all the time pulling the toad or not. I bought a new Cap and it has a Temp gauge on the top but it didn't fit
Hope this was some help anyway,
1982 Pace Arrow 30ft.
KarKaddy SS, Toad:99 Concours
Lilly and Rubie Our 4 legged Kids & Tim & Joe