Big Block Radiator in a A Body Question!!

Here is a well known fact. 22" 3-core 1/2" tube brass radiators cooled all factory big block and Hemi Darts back in the day with no overheating problems. A 26" radiator won't cool any better as the opening in almost every A-Body is made for a 22" core, unless it is a 75-76 A-Body, but since you didn't tell us what you have we only can ASSume wht you have. Buy the Griffen and have it tested, you already answered your own question...