cummins build
 

okay got a 90s 12v going to keep the ve pump but installing 4200 gsk and dennyt stage 2 pin also going to get a Fass 150gph pump also going to skip a tooth 22deg timing is there anything else i should do to the ve pump since I am going to go with either 5x14 or 5x16 injectors trying to push 500hp out of the engine. Another question is should i run a 62/65/14 turbo or 63/68/.88 brog warner air werks S363 S300SX. any help great appreciated thank you

Head studs, maybe fire ring the block, a good lift pump, is that 4200 governor springs? It should scream.
What have you heard about the 62/65/14 I think that what most of the 12V guys run right?

yes 4200 governor spring and plan on doing headstuds not sure i am going to fire ring the block just dont have the money for it. I have heard a lot of good things about 62/65/14 and a lot of the 12v guys do run them just wondered anyone else opinions on larger turbos since the truck will be a dd/tow rig

I am nowhere near being an expert on these but everything I have read points to you trying to do things that conflict with each other.
Ultra high HP in a VE and a DD/tow rig on single turbo
This is compound territory and some very fine tuning
Would suggest you chase up some of the threads on here and other forums on DD/towing rigs and work from there.