7 1/4 with 3:55's or even 3:23's

69moredoor said

So how is a stock 225 with a 994 and 3:23 compared to 2:9/2.7 whatever rears? Assuming stick tire size.. is it that bad on the highway?

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Which stock tire size???? The OP's talking '73-'74 Duster, 3.23's are a great step up if that's rollin' on 205/75-14's, 13's on an early-A would feel more like the 3.55's.