Re: need advice on a 4.2 v-6 swap
A V8 swap into your truck is not a difficult thing at all. 1997 - 2000 F150s had the 4.6 SOHC 2v V8 and the 5.4 SOHC 2v V8. Either one of these from a 1997 - 2000 F150 will fit like a glove, and should bolt up to your five speed gearbox. I can't forsee any real difficulty in doing this swap, as the 4.6 and 5.4 came stock in the F150 anyway. I think the 2001+ F150s are a bit different though, but I may be wrong.