Cummins diesel blocks can be bought in alluminum, I have one in my pulling truck, Bigger injectors, gt42 turbo, bigger intercooler, the works, but I'am safley turning close to 900hp but drivability is a factor, For a drag car it would be alright but as a daily driver it wouldnt be practical. Plus I have to inject water to cool the motor and the the rich black smoke would get annoying in a car. But I would love to see one driving down the road. It might be more practical to buy a diesel motor from a 81 to 83 maxima and building it up a little. just my thoughts and ideas on the subject. Good luck on your build.