I did a back to back engine dyno test on my 526 C.I. Wedge with Indy SR M.W. heads, with one Holley #9375 Dominator 1050 CFM on a Indy 440-3 intake it made 775 HP, changing the intake to a Indy dual dominator tunnel ram and adding another Holley #9375 that motor made another 30 HP up to 805 HP
Every Mopar engine I've mess with like more air and fuel, SB, BB and Gen 2 426 hemi, same thing on the early gen 1 Chrysler Hemi motors also
On your deal switching to the bigger carbs., you may not see a lot of gain from that. If your not getting rid of the 950 carbs it would be real interesting to do the swap on the carbs only and go from there