Well, the Olds 403 was found in these cars, and for sure headers were
available for that.
I don't know enough about Oldsmobile engines to know how similar the
exhaust port layout is on 403 vs. 455, but there are some comments
here that claim that 403 headers will more or less work:
They shouldn't fit, given that Jegs has different part numbers for 403
headers (all of which fit Cutlass and Firebird) and 455 headers (which
only fit Cutlass).
Talking with a header company is your best bet.
did some quick searching and found a list for heads for the engine but
dont know about them fitting in the body, still you might have to
contact a company, or person to fabricate them for you. here is the
link with the list that i have found. hope it helps.
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