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Probably not giving enough info but I figured I would take a stab. Will long tube headers form a 460 work for a 390 ? Not sure what year headers are but the 390 is a 67.
The 390 is a member of the FE engine series while the 460 is a member of the 385 engine series. The heads are different, as are the intake and exhaust manifolds. No interchange between those two series of engines.