Hughes big mouth heads

It’s around 3350 with me In it , before the big mouth port I had the stage 3 Hughes port and ran best of 6.69, had to pull motor and had the big mouth porting done and changed my converter , and it slowed it down but track was bad and I haven’t gotten to take it back this summer been to busy working, but mph was off around 4 mph from the other runs, I had the engine dynoed with the stage 3 and when I put it back together ran on the same dyno with the big mouths , I know those numbers aren’t popular but same guy and dyno for both runs ,