David, You have gotten several good replies and a couple from Turk(insert rim shot here).
Let me just tell you that I dated a girl that had sex with 50 Cobra owners. She said the 25 BB guys had small Dugans and the 25 SB guys had large Dugans. Using these facts as a basis for my decision, I am going to put a SB in My 289 FIA.
edit: The girls in Boca LOVE small blocks!