For $400, I think you can bring it home and see what it has in it, possibly run it with the pcs it comes with. I have one that was the first engine I ever bought, put it in my 37 GMC so I have a bit of a thing for them. When I got my 71 Monte Carlo I built a 468 for it because I couldn't keep the 350 in it and got a 454 cheap. If I had found a 396 or 427 it would have went in it as well. I do have a 496 in the works for the 37. For me, I would have a hard time spending alot of money or machine work on the 396, if you are going to do that, then I would start with more inches. If you can keep from tossing a ton of money at the motor, then I think it would be a great one for the truck. Worst case you get it running and then put it in something else when you decide you want to go bigger.