I checked both of my cars, the boxes appear the same but the steering shafts are completely differant so I can see how bigger headers would be a pain to get them to fit. Do you think that switching to a s-10 manual steering box would create a little room? Also I did not know the switched the steering configuration in '73, I thought these cars were pretty much all nova except for the pontiac front sheet metal, drive train and tail lights.
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