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The 330HD, 361FT and 391FT were all truck engines. These were in F500 and F600 trucks, as well as a few F750's and many industrial applications.
They used an FE style block, but there are some differences. These engines had a larger oil pump drive shaft, consequently the pilot hole in the block for the distributor is larger than an FE block. The 361 and 391 blocks were sonic tested for cylinder wall thickness, just as an FE 427 was. I have rebuilt several blocks that were cast, but not drilled for the side oiler design as was used in side oiler 427's. The FT series also had steel cranks, but not cross drilled and the snout of the crank was much larger than an FE. These cranks can be used in an FE block by turning the snout down to the smaller diameter. The heads had sodium filled exhaust valves with a 7/16" stem. The exhaust seats were stellite and both intake and exhaust used one piece rotators. The intakes had 3/8" stems like a FE head, but the valve head diameter on both valves is much smaller. The pistons were much longer and heavier than an FE. The exhaust crossover in the heads is different than an FE and so the intake manifold is different too. These engines used either a 2 or 4 barrel Holley, with a governor controlled by the distributor.
Just like the Dodge 413 HD and Chevy 366 these were purpose built heavy duty engines that were not put in pickup trucks or cars