First 318 build, cam question

LOL on Summit recommending Crane springs for the 6901. If I've done my research right, the cam is a re-boxed Crane Fireball. I have it in my Demon (68 318, 302 heads, Performer, 625 cfm AFB, 904, stock exh manifolds, 2¼" pipes, Dynomax mufflers). I used a set of 340 springs I got off of e-Bag in the engine build. Starts easy runs, runs well, pulls 2.92 gears on a 7¼" open rear end well. I haven't track tested because I don't trust the rear end. On the basis of a little street driving I've done, I'd recommend the 6901 cam.

The build design calls for a 3.55:1 rear. I have most of the 8.75 SG parts but need to finish a couple of projects before I start another.