You do not have to have a reduced based circle cam. YOu can use the standard hyd. Roller cam if you buy the link bar hyd roller retrofit lifters made by crane I have always had to buy custom length pushrods when using roller rockers and aftermarket heads. I like the crane 1 piece hardend. .080 wall thickness. Good Luck
Comp Cams will grind any of their roller profiles on a small base circle. Then get it through Summit and it dosent cost any more than a standard roller cam. Thats the route I went.