11 second 12 valve
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first not sure what compound the tows are, i think its the super b and a 66/74 .91 t4. potentially if you pushed them really hard/ hot you may break 11's. first thing id do persoanlly is take the full cut dv's out of there as im sure it smokes like a freight train and probably loses some power there and put some actual streetable dv's in it. jack the timing to about 28 and take it to the track and see how it runs. and learn how to drive the truck. 13.6 seems a bit slow for 500whp so im assuming his driving skilled leave some to be desired. id also get afc (another personal preferance) for ease of tuning on the fly. and not sure what he means by 110 valve springs as they dont exist for 12v. once you start learning how to drive it and start tuning it up you will learn what you need for fuel and air. your likely going to need a bigger compound kit, and possibly slightly larger and possibly better injectors. make sure it has a fuel pressure gauge and look into a tork tek over flow valve for reliable fuel pressure. id start there. also doesnt say tire size or gearing. that can have an affect