Citizen:
Not at all....
Mine actually smoothed out some. I did notice that a couple of the boots were a little difficult to get seated on the new plugs. Check your spark plug wire boots and make sure they are all on the plugs all of the way.
This was kind of new thing for me in that I haven't done very much of this kind of work in quite a while. I used to be REAL good at it back when everything had CARBS and Distributors. Now since nothing has either there is a little bit of a learning curve for me.
I was a little taken back by the depth of the plugs in the intake. They look like that they are in at a weird angle too. Might be a good design but not good for service. I took probably more time than I should have but I was real careful to make sure they were all in and all connected right.
Check your number 6,7,8 plugs. Those were the ones I had the most trouble with... I am sure you did as well.
HTH
Cheers,
-Jay