It's a Comp XR228/230 571/573 112 LSA comp pt# 54-428-11 I am wanting to find this out so I can order the correct pushrods at the same time I order the cam and springs. Also what is the base circle on the stock 2000 cam?

 

it's 1.553 on the stocker and i'd say about 1.46 on the Comp cam

if you are on stock heads and head gaskets, i'd say a 7.425 pushrod would do perfectly