[Jim Vander Wal]

If they are Superformance headers and specific to your engine they should fit.

Things to look at:
Flange bolt spacing. Normally 2" centers around the ports, set in a straight line. Is this what your heads have? Some heads have the bolts at top left or right and then bottom left or right (opposite the top). I don't think Superformance ever built a set for this bolt layout.

Superformance had at least two different tube designs. One a single diameter tube another with a slight step diameter. Neither has significant advantages over the other.

The head face to header/sidepipe dimensions are all common as the same sidepipes are used for all engines.

Not sure on the price as I've been out of the Superformance ranks for a few years now. But I doubt that there are many available on the used market.

An aftermarket set as offered from Firefly Performance Products will cost a bunch more. I have a set of these but they are for AFR 205/225/220 heads with a 3" bolt spacing.

Jim
Former owner of SPF 1855 & 2584.