Wicked wheel for a powermax way back when and a mishimoto "upgraded" radiator about the same time. I stopped being the first one to jump in a boat after those.
500 hp is the maximum and isn't likely to be reached. The most I have seen someone get from stock sticks was 498. Your dyno numbers are limited by your fuel, I wouldn't expect to gain anymore from the stock injectors.
It doesn't take a lot of fuel to see improvements. Back when I ran a S366...
I did mine several years ago and used oem fx projectors, I am really happy with their output. With that said I would hands down run the morimoto mini h1 7.0 projectors if I were doing it today. They are nearly drop in. To fit the fx projectors it required a lot of cutting and sanding.
Check...