Going to be tuff to get a 275 under a stock 67 subframe up front. You would need an aftermarket frame or ride tech true turn set up with inner fender modifications. I have a 67 with a stock subframe with 18" wheels with 4.9" BS . Limited to 235, max would be 245 without fender mods. You will start running into frame rubbing issues when steering is locked as well as fender rubbing issue. I am not an expert, but have been thru this.
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