[Gaz64]

Ralph,

I don't know how you're going to get 330 cubes from a 289 without stroking it.
41 cubes is big rebore.

As for your cam the .006 figures dictate idle quality, .050 figures dictate mid to high rpm, so if you want the best of both worlds pick your cam for idle quality at say 270 degrees and go for the grinder that can offer the fastest ramps to give you the smallest difference between .006 and .050 figures.

My flat tappet has 276 @ .006, has 242 @ .050.

And as other boys have said, if you have choice go for a roller cam.