Don't know anything about the Thorley headers, but I do know this. You suffer the same fate as I with headers. You own a 2nd gen. F-body (LOL). Unfortunately, teh 2nd gen. Firebird has got to be the most difficult Pontiac to fit headers in (next to fitting headers in a 3rd gen. with a "traditional" Pontiac engine). Regardless of what you select, you're going to have a hard time. I have found however that the Hooker Super Comp's bolt right in without having to tweak any of the tubes to clear the frame/chassis. They're still a bitch to bolt in, but they didn't require any tweaking.
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Just a blind squirrel looking for a nut.
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