If the steel centre was coming adrift from the fibre (see my YouTube videos linked in my previous post) you may have had a sort of variable valve timing and also variable ignition timing due to the play in the cam, hence altered timing at the distributor. If you timed by strobe before you replaced the timing gear the strobe might have shown some unsteadiness or variation but if you just did static timing it would be hit or miss where it ended up. It wouldn't have been far out but now with the new gear it might be enough out to take the edge off of your performance. As Ron says there will be no difference with the revs and speed but you might need a bit more right foot.

I have to mention, but hope you didn't, that if you have replaced the timing gears one tooth out you would notice the difference even though the engine would run.