I'm building a 350 bore .060 forged dish pistons with vortec heads/port and polished and I'm going twin turbo. What kind of cam shaft should I use

Better get a better block 😉

You can call jegs mail order or go to the store either one will be able to help you

Well you could go onto the store for assistance as they can get more information about you're engine build and they can help you get and or contact different venders for you

Should contact a cam manufacturer like comp cams