Fitting TTi headers on a 273

I did a install of the TTI shorty headers on a 273 awhile back.I bought the correct part number for the 273/318 small port. You can weld them up. A good tig welder should be able to do it with no or little heat damage to the chrome pipe as most of the heat will be at the thick flange area. That's about all you can do at this point.