The parts to rebuild the accelerator pumps on my 1990 135hp Black max are no longer available so I was looking to replace the carbs. I have found a bunch of mercury carbs off newer 135 and 150 hp mercs that don't have accelerator pumps. They all have the same bolt pattern but i am not sure if they will work with my 135. Is there anyway to cross the part numbers or will they work as long as the bolt pattern is the same? Also with I get the same acceleration with the new carbs that don't have accelerator pumps?

Any of the newer carbs from a 135 should be fine provided the jets are correct for the new carbs. Acceleration will be fine, the newer carbs have different idle and off idle jets to do the job.
Same goes with 150 carbs, Just make sure your timing is set safe for a 150.
Burned pistons are no fun.