Tubular k vs factory k

Paul Davidson said

And I'm having issues with header fitment and stearing box hitting headers that I didn't have before also I'm converting to a 360 from a 273 any help is appreciated

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If the headers fit before with a 273, and they don't fit now with a 360; then you changed something else or you have something installed incorrectly. There should be no issues now with header fitment that weren't present before. Did you re-use the 273 mounts, or buy adapter mounts? Which ones? New or different biscuits? Which ones?
More info and pics or at least a description of the trouble area(s) would go a long way in figuring this out.