does ne know if a 99 24 valve would fit in an 88 f250? will it hook up to the ford hd 5 speed do they make an adaptor plate? or would i b better off with a 12 valve?

 

Yes, it will fit. Takes the same amount of fabricating if you do it yourself or you can buy the mounts and such. FordCummins.com has the adapter plates. I think Auto World does too. The 24v will have some wiring to do so its best if you can get a complete donor truck.