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.
I missed the carb part, either go A-500, they can very easily handle the power especially with minor upgrades and the low 1st and 2nd gears help get the heavy rig moving and the smaller converter and less friction... that or go with a 5 speed. I put an A-500 in my 1 ton van with a 5.9 and it has lasted a lot longer than the original big transmission and is very noticeably faster and better MPG.
Does your magnum block have an oil hole to oil the LA rockers?
