401's seem to run a little hotter. Mine was punched out .030. It Ran cool enough when every thing was up to snuff.
One time I bought a new water pump. The 401 ran hotter. Apparently it was a pump for a 360. It did check out like my 81 360 pump.
I still had the old pump. the shaft was an 1/8th inch bigger and the old worn down impeller looked like it was more heavy duty in it's younger day.
Some cars rely on full time hot water through the heater core to help cool one of the banks of the V-8s.
Age has allowed me to forget who's V-8s You can mount a tranny cooler between the rocker and the frame on Passenger side to help with the cooling.
BTW I timed at 8*
Good Luck.. Don S..
Sold our 1976 Wagoneer 406, MC4300, TH400, QT, TruTrac, 2" lift, 31x10.50s, duel Optimas,
It’s took us over 161 Colorado Mountain Passes, 3 Jeep Jamboree USAs & 2 Ouray Invasions from 1985 to 2010
ACRONYMS & ABBREVIATIONS HERE