Chang cams

Hello I'm trying to get some information about my motor it's a 89 360 l roller I put a comp thumpers cam with 282 513 lift took stock heads off not sure what heads came on this block but I bought some j heads any way my question is can I change to flat tap only reason why I want to do this is roller cam and lifters cost me a lot and I want a bigger cam in this motor thanks in advance