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Well, ya pretty much answered your own question. The FT engines typically (maybe always) have the larger pan and the rear pickup. Look for the larger F Series trucks, like F600s, buses, dump trucks etc.
You can find them on ebay every so often. There's guy on there now offering cleaned and anodized FT pans for about $80. That might seem pricey until you look at other Pan prices (Canton, Milodon etc). And those other brand name pans don't usually fit a 2wd 67-79 FE powered F Series.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.