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I have the same truck, 68 F100 360 C6 auto long bed, and after I bought it, the single stock exhaust was so bad that it needed replacement. The cost was so high, I bought some Headman headers and ran dual exhaust with turbo mufflers. Sounds great, runs great, had to bend the tranny tab a 1/4" inward but other than that they fit just fine. Watch the heat to the starter, mine fried and that sucks with an auto (no push start).
On my other truck, I have the Hooker supercomp and they fit nice too. I bought the ThermTec starter blanket for $20 and made a steel plate for between the headers and the back of the starter.
Dynomax also makes some for that app, but I haven't tried them. JCW sells them for about $100, the Headman's cost me about $90.
They might be blackjack headers, it's been so long I don't remember. I got them at SuperShops, but they are out of business now. Jegs has them for under $100 for the DynoMax. I like Jegs, the customer service is excellent and no sales tax.
Part # 289-85041 65-76 352-428 $91.99 1 800-345-4545 open 24/7
cerama-coat ones are 289-86041 $209.99