Tubular k vs factory k

I'm thinking of converting to a tubular k frame from a stock one not sure how strait my original is. 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
Check out @HemiDenny he is on FABO pretty regular. Can’t go wrong with his product. I have been thrashing on his work for years and still can’t break it! Hah!