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Man that is a really nice way to say...Nick you are off your rockers...

...No really thanks and it would be cool but not something this car needs to be. I told my wife and she said thatwe bought this car to get out of the truck world alittle and then here I go putting it right back into it with thinking about a Dmax engine.
Really thanks for the nice words and your post is a reason I felt I could get some real feed back and not just a hatter remark

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Nah, if I thought you were off your rocker I would just say so.
I think the big block with EFI is a great way to go. But with any budget concerns the EFI could wait. The D Max on the other hand would be cool. Great power and MPGs. BUT...the expense of the swap, upgrades to the motor and trans, fuel system, chassis, brakes and all the other little stuff to really make the car :right: with that drivetrain will cost a small fortune. So I guess it comes down to your budget and desires. If you can swing it and still keep the wife happy then do the Dmax. If you want something more traditional and I am guessing A LOT cheaper to finish then do the big block.
Either way, you can only get so much power to the ground(to hook anyway). So to me the big block makes more sense. Still lots of fun, cheaper in the long run and maybe a little better for resale if you ever decide to move on to another project. But the Dmax is all over the "dare to bo different" theme.
Confused yet?