Edelbrock actually reccommends 2 600cfm carbs on the CH-28. On both my 440s I have used 2 500cfm carbs and it worked FANTASTIC. If a person already has a 600cfm Eddy carb I would buy one more and call it good. Alot of small block chevy guys run dual 600s on their eddy 2x4 set up and claim success. My 360 will run an OFFY 2x4 and dual 500s.

Keep old mopars alive.