Stock cam is good. Just get big enough turbo to make it breath to 6k rpm's. Head is your worst enemy on 603. Needs porting, 606 metal headgasket and pretty much everything rebuilt for longevitity.
Not 100% sure but I just remembered that pistons might not work. Valve pockets are different (4valve vs 2 valve). Rods should be bolt-on and you can safely run 35psi boost with those rods. You NEED oil squirters for pistons & pins. Otherwise you can say byebye.
KKD motorsports here makes some ultra hyper quality manifolds, flanges etc. for benzes. 603 exhaust manifold is around ~$800

you guys are my heros. I'm not to familiar with diesels or anything, I mostly stuck to gas but this makes me want to go buy a diesel to add to my shop. I have sooo many questions but will try not to bog you down right now but anything in the future I wanna know about diesel performance I am definitely coming to you hahah




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