ANY 1966-'72 B-BODY (or E-BODY) factory equipped with a 440 and a 4-speed manual transmission SHOULDhave a 26" radiator/core support and DANA60 rear axle
exceptions exist but they are extremely RARE - they should be viewed under a microscope & the question asked WHY? and is it a real factory built example or a decades old "FIX" for any number of reasons