I own a 70 Mach 1, and it came with a 351C. I stroked the motor, so I wanted to install a big block aluminum radiator for extra cooling. I purchased new upper and lower BB radiator mounts, but the radiator core support interferes with the fit. Can anyone tell me if I need to cut/trim the core support where the original 351C radiator bolted up? I'm looking at pictures on the internet and it looks like Ford or someone trimmed the opening. Please send your opinions. Thanks.