Actually, its a 390 with aluminum heads SpeedMaster. I may just pick up a 46RH. I think I would be happier with that. This is my 3rd Dakota and only problem I've had with them is the electrical. Looked for a couple years for my 03 it has manual door locks and crank up windows is an SXT. The block is a Magnum, heads are LA type. Bought a Hughes cam about 570 lift and 236 duration. Should make about 500 hp. So would rather do the 46RH now than replace the 42RE later. Thanks to everyone for replies.