Welcome the Oilburners and glad to see ya here.
Take a look in the FAQ and TECH sections, as what you seek is likely there! There is so much information here and the search function works well. Also take a look at the Hall of Shame so you don't spend money foolishly.
Now for cams Russ known here as Typ4 has a cam that is a good torque cam and R&D performance has a different one that bleeds off some compression for higher boost.
Valve springs people usually go with comp cams IIRC 910 is the #'s
As for heads port your own or have them professionally done. There are pistons with the pin 0.010 higher in the piston to lower compression and you could in theory mill a small amount off the tops. Studs try Justin at R&D performance again as he has good prices on ARP studs.
There are lots of build threads here to search out and learn from so no reinventing the wheel needed.
Heck apparently there is now roller rockers from harland sharp too.
IP's well for a performance IP there is Conestoga Diesel, Mel is the owner and his name here is Agnem he has the Moose pump series and they are well known. He also has some modified injectors, which may be what your looking for.
R&D also does provide IP's as well so there are options out there.
The factory Turbo 7.3 engine uses different rods with a 33mm not 28mm wrist pin so that could be something to consider, however that affects balance and requires the matching turbo harmonic balancer and flywheel if you are going manual.
Turbo's well there are the three main players, ATS Banks and Hypermax, and different ones from each brand. Or you can custom build one of your own liking.
remember use the search function as there is so much here and read lots and learn as you go.
Again Welcome to OB
Al
