I think it's possible to do it with the radiator in. At least I've done it on my '66. Having said that, I now remove my radiator because I've always banged up the radiator fins when doing it with it in. Also it's a tight fit in there with an open end or box end wrench where I always bang up my knuckles as well as the radiator fins.
Rev
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.
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