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FE Performance Exhaust Manifold Interchange Guide
  60-64 Galaxie 65-68 Galaxie 66-69 Fairlane 67-70 Mustang, Cougar '65-79 F100-250 Pickup
'60-64 Shorty Yes No No No Yes 3 4
'62-64 427 Long Yes No No No No
'65-68 427 Long ?? Yes No No No
427 Fairlane ?? ?? Yes Yes 1 ??
390 GT ?? Yes Yes Yes 2 ??
428 CJ ?? Yes Yes Yes ??
Notes: Unless otherwise stated I have either done it or tried it and know it can't be done.
    ?? Unknown
    1. Shoe: Requires minor grinding on either the manifold or the steering box.
    2. Driver side manifold modifed slightly to fit the 67-70 Mustang & Cougar
    3. Mark 'Louie' Harper: On a F-100 or 250 they will fit if you grind a half-moon about 1.5 X 3 inches in the upper frame rail on the passenger side and remove the heat riser 'bump' on the header.   No modifications are necessary on the driver side.   Be sure and re-enfource the frame rail.
    4. Mike Question: On a '68 F-100 with the Bendix Power Integral Steering Box use the 428 CJ left side exhaust manifold.
Bob: I think the more common and less expensive 390 GT manifold would work also.