as this car wasnt a 400 to start with (judging from the hood), you most likely dint have 3 items that were on 400 `s and AC cars...and when you put a 455 in it those would be required
1) X filler panels
2) lower baffle
3) rubber or 'masticated' fillers on ea side of bottom of radiator
If you have those...keep looking, but if you dont have those , I bet installing those will bring you down 20-30 F....
I have already run my car with a practically brand new 455 in Oklahoma summer heat WITHOUT my original x panels, lower baffles or rubber fillers (to be installed after I get it painted) without any cooling problems whatsoever.
It's my opinion that if you have solved your cooling problem, the added benefit from those factory fixes is not all that great and should not make the difference between boiling over and not.
