Look up Mark Stielow's 64 Chevelle build in Popular Hot Rodding some years back. I'm guessing 6-8 years ago and he shows a step by step.
Keep in mind that 64-65 A-Bodies have the wheelwell up against the frame rail so to gain anything, you'll need to narrow the frame rail the same amount so it's way more work than most cars. If you nail the fitment, you can get a 275 in a stock wheelwell but to gain another fraction of an inch will require some surgery.
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