Wanting to find out what type of bolts were originally used to fasten the headers, hex or socket head?
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...I believe they were Hex Heads.
You can't deliver much torque with a 'Allen' Head tool. In My View. They work but have a Smaller 'Contact' Area.
The Smart choice is A 12 Point Bolt Head, gives you more Angles to wrench on, around the Tubes. If the Box End Wrench is Too Close to the Header tube for clearance, Grind it Thinner. I found there is No room for a Rachet Handle and Socket! Of course, with a Hex Head you can use a Open end wrench, but it will try to Slip!
Depends on YOUR Header Tubes.
Thanks for your reply and recommendation, though was trying to ascertain what was used in the OEM car?