I was looking at a cloyes timing gear set but it is only for 2.8 and 3.1's and I was thinking is it because the timing chain cover (the water pump)?
Are the blocks different?
How much have the water pumps changed?
I have a 3.4 long block covered with 2.8 stuff (intake, water pump, oil pan) will it work with the gears?
I know the cams have changed from 3.1 to 3.4 but that shouldn't matter.

 

the pump is the same except that v-belt pump rotate one way and serpentine belt one rotate the other

I have the cloyes true roller chain in my 3.4

 

You said roller chain but you mean gears right?
Is that what you have, the so called 3.1-2.8 only timing gears in your 3.4?

 

thats what I have on mine, heres a pic of its sproket on the crank