Re: rear axle
What year C20 rear end? Is it 8 lug or 6 lug? Any rear end newer than '70 will be wider than the 12 bolt you have. That can cause tire clearance issues. The '71-'87 differentials are 1.5" wider. The '88-'98 differentials are about 2.5" wider. I agree with keeping your 12 bolt and just fixing it. It can be done for less than $1k.
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