Any tower from 77-79 f-250 4x4 with a 351/400 will work for you. The early 77 high boy with a 400 uses the same tower as the low boy 77.5-79. I just took a set out of a 79 f250 4x4 and bolted them right in a early 77 high boy and the 400 bolted right in. You will need to get the motor mounts from TransDapt, L&L, West Coast Bronco sells a nice set as well.
'79 F250 13" lift 42" Super Swampers
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