Which do you want, 14 flat or 12.9 ?? For a 14 flat, pretty much a stock 360 that's "up to snuff" (meaning the heads are good and the rings are sealing) with a 4bbl and headers will run you around 14 flat with the 3.91's. For 12.9's, I would add a cam of size around .450-.474 lift, and 216-224 duration @ 050 and some work to the heads (bowl work, maybe cut .040 for a little added compression). In both cases I'd run a 750 DP.