I put together a z6 block with a y8 head,mani,and dizzy with a p28 ecu I bought a blox cam gear cuz timing seems a bit off but I've read that I should go 4 degrees back. Is this right and should I go get it tuned

 

is the cam gear you bought for a Y8 or Z6?

 

I orderd y8. But there's two spots where it shows how much adjustment you could make and one says y8 and the other z6