Does anyone out there know anybody who might have swapped a 12 valve into one of these trucks? Has 460 4speed in it now... i have done an 06 ford with a 12 valve and am doing an08 with a 6. 7L and an allison right now and was talking to levi at destroked and he was sayin they are even more time consuming than those... I am trying to picture this in my head why... . I need to do a quote for a customer and not sure about hours job could take... .