how do I tell what kind of cam and lifters i have?

i know theyre pricey, but im not trying to buy them I already have a brand new set of 16 lol. i just want to know what kind of cam i need to run with them. They came with a 318 i bought but i have no clue what kind of cam i need to run with it. Im guessing a hydraulic flat tappet? since theyre "tappet" lifters??