Slow build 71 Scamp 440

Headers tti 1 7/8 collector 3 for A-body

Guys. Need your help. Talking to a guy that has these for sale. No part number and he bought them in 2002. He wants 400.00 cad cash. I can't find info on them anywhere. Anyone recognize them. Good for 500-550hp? Little rust.
Good price?

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