They do not want any excess weight reduction in Stock/SS
they DQed my car in 77 at Winternationals and it took all night to
fab and weld enough of the fenderwell back in from a wrecked 64
from the wrecking yard in Pomona. After that you would have to remove engine
to get header out.
None of the fenderwell headers I have ever bought can
with templates. I wish they did. Maybe they may now as this
was years ago.
Start small a work you way up =It is hard to put the fenderwell back in.
NHRA only allows 1 inch around the header for installation.