Ford engine question.

If its a 4V Performer intake, it will say 4V right on the intake. Also the Performer 4V has no choke well as the 2V does. Great motors, had one (2v heads) in my 57 Fairlane.
4V head theory was interesting...they made them huge (maybe too big) and then when they made the aluminum versions, the ports were smaller. The 4V Performer intake did not have the full 4V port size, they thought it was too big too.