I pull tractors in the Limited Pro Stock class and we run a DT466. Get the newer style block...they have bigger lifters and can easily be converted in to aftermarket roller lifters. We are getting about 1250hp out of ours right now. The only injection we use is straight water ( no NOS, propane, or methanol). I have a 79 F-250. When my 400 gives out, it is getting a DT466 and an Allison transmission. I am building the engine with all of the spare parts we have. Here is a heads up...you want an intake manifold off of a 93 International truck with a 466. They are a larger volume, and have a better air entrance angle. This was all to accomidate for an intercooler in '93.