Forgot to say. As long as he uses a good quality multi-layer soft ally or copper header gasket he should remain leak free as well.
I would never use the supplied gaskets no matter what the brand.
Steering rod - is there an easy way ?
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tti's have serious flanges! Morgan, before you fit the new headers wrap a piece of fairly course emery around a flat piece of wood about 8" long and rub that across the exhaust ports to remove any soot and general crud build up, gives whatever gaskets you use the best chance of sealing. Stuff bits of rag down the ports so any muck doesn't go into the cylinders. Another trick, bolt up the headers without the gaskets and check to see you are happy with the fit, then remove the end 2 bolts and loosely screw in a pair that are about 2" long, remove the other bolts and slide back the header and drop in the gasket then refit all the original bolts. This is the best method to avoid ripping the gaskets