In reference to the 28 or 50 oz balance, I was told by DSS, Coast High Perf., and another shop that 28 oz is the way to go with the 331.
Tom Nageal at DSS said that I could use my stock damper (50 oz), but that getting it to balance would take some serious drilling by the machine shop. So, in the interest of safety and with the future blower, I decided to go with the 28 oz Fluidampr.
The 331 also has a nice rod ratio - which, I think means better longevity by not loading the side walls as much as say a 347 would.
DemonGT - if you're thinking of going with a 351 based stroker, I hear the 377 w/blower combo works well
(a la Dan)
E