McCandless did an back to back deal just like that when the Eddys came out--was over 50 HP gain IIRC may have been a little more
simple answer to simple question- something you do not get on this forum very often-- -McCandlessboy is memeber here and if you can contact him I am sure they still have the data
but call Marsh Perf and get a set of Sidewinders for way less than Eddys and do exactly the same result if not a little better and save enough to buy a nice carb.