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I am not sure NHRA had a class for that set up. Maybe A or B Stock in the old days or SS/D like Barry Musser ran. AHRA is probably different. Not sure how competitive a 69 425 horse chevelle would be today.
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My old class guide has the 427/425hp Chevelle in it, but I can't remember what the original factor was...it woulda jumped around there for a couple years, but I think they eventually landed in SS/D & A/S...I belive it's a still a natural "A" car today, which is a horrible fit for it...if I'm not mistaken, Borgstrom now runs his L72 Chevelle now in AA/S...?