Carb cfm with ported heads?

410ci with box stock Edelbrock 63cc heads, been running a 750cfm Proform electric choke street carb.
Considering an 850cfm or even 950cfm Proform or Quickfuel RACE carb now that the heads are getting a max port job.
3.23 gears
2.5" exhaust
3500 stall converter
28" tires
241/247 5.45 lift cam.
Thoughts?