IMO, going with a std port and not a MW port is a big waste of time. 500 inches needs a port!
Hell I use MW ports on 440's. If you have flattop pistons you'll either have to change the pistons to work with smaller chambers (best way to go from a power stand point)and then the EZ heads will be great.
Or you'll have to run the eddy heads. Edelbrock has redesigned the Victor and I can tell you OOTB it aint very good. It needs porting.
Brian