Here is my advise ( talk to these guys for your build)
Hamilton Cams for Cam, Valve springs and push rods.
Mahle Pistons.
Southern Diesel Extreme for GSK and injectors. and Delivery Valves if your towing stay way from laser cuts.
Get a good turbo like Industrial Injection.
ARP headstuds
Goerend Trans parts
Have your P-Pump bench flowed and build by a good shop.
Haisley Machine is a good source to talk to as well.
Aden at GOS is also a good source.
With these parts your should have no problem hitting 500 hp.