I sent my pump in for a rebuild awhile back, as it was doing some weird stuff. As it turns out the rebuild was overpriced and totally unnecessary.
If youre gonna do a build, make it worth your awhile and do it right with a good shop for sure. If youre looking for lower power levels just get a reman pump and put some basic mods on it.
Also, Im not 100% convinced a 215 pump makes smooth power on a street truck that originally came with a 160 pump.. No idea why but seat of the pants dyno has never liked the results with the 215 since I got it. do your research if youre in that boat.
Then again, all that is likely between the seat and the steering wheel. Hell If I know.