Blake
Seems like the 331 is the flavor of choice. I also went with the 331 because of the
oil ring issue. My engine is supercharged so I couldn't afford to go with the higher placed ring pack on the piston. The 331 also requires less clearancing of the bottom of the block and bores The late model block is a pretty lightweight piece and I wasn't comfortable with the 0.030" over bore with the 347 stroke placing higher side loads on the bores. As far as power output goes, as always it depends on the cam, heads and intake package. With a good set of heads, a single plane intake and a cam around 225 - 230 degrees @ 0.050" and 0.5" lift you should easily be able to make 400 HP and still have a decent idle and low end response. I have the Trick Flow stage 1 roller cam in mine and I wish that I gone with a more aggressive profile.