Recently got a temp' gun, and was checking stuff. I have a 292 in an F600, after a short run, at idle, I got these readings.
Manifold under carb..150 ,,I made steel inserts at the head/manifold with 3/8 holes
stock Ford 1/2" heat dam spacer..139
1 1/2" alum spacer..115
float bowl..105,,,,,,flat top 1.01 venturi
remote oil filter beside fuel pump..173
valve covers..145
.top of rad'..184,,,,temp. gauge reading inside..190
 Ram ex manifolds..250
    Comments ?