I've had luck with OER and Steele in the past. There's a lot of brands out there, but many of them are crap (slight molding issues, too thick, etc.)
My 2 cents/if I were in your shoes: I would give roadstershop a quick call and ask them what brand weatherstripping they like to use for their GM A body builds. They've been through a few and know which ones work vs. the crap and in my experience they are pretty good about helping the build community out.
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