What is the correct operating temperature for a 1987 454 MAG with carbs? Right now it is running 140. Is that not a too cool? My mechanic says leave it. Right or wrong ...good or bad?

That's why he is the machanic !!!!! Right where it should be.

Between 140-180 is good.

Carbed 454mags have a 140* T stat. It should run 140-150 on the gauge.

Thx for the info ....just checking.
I am only have what my cars run @ as a marker and that is why
I thought it might be running cool.