It doesn't have a cam in it, the cam was pulled out for sale. I can sell you the Cam-Motion cam, as well but it might be a little large. I beileve it's close to a .600 lift with 1.7 rockers.

 

would an E303 work in it?

 

Any cam will work fine in this block, it just depends on your combination.
Just if you go with a large cam like the one I have, you just have to check PVC.
Actually, you should check PVC with any cam/head combo you put in.