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Back in the 70's when I was in HS I had a '55 F-100 that the previous owner had swapped a 390/FMX into.The boneyards in SoCal still had a pretty good variety of parts at the time,I found a set for $50,and had them installed along with dual turbo muffs.Going from a single to duals I noticed a small difference even with a worn out 390 in response.I don't recall having to do anything to the frame to make them fit,but I guess alot whould depend on how your motor is positioned in the eng bay (this concerns eng swaps).I'm supprised someone hasn't came out with a set made out of tubing considering all the FE/61-66 engine swap/header questions that are asked.Al