"Greg, the only issue I have with tight lobe spreads is he's probably going to run a very restrictive exhaust, increasing overlap when you have a restricted exhaust can kill (or severely limit the effectiveness of) that "fifth cycle" scavenging effect, especially with the mild street type compression he'll be running. As for "optimum" LSA's that really depends a lot of the head flow and valve configuration, but this one wouldn't be anything close to 106 IMHO twocents "
Running a tight lsa means the total duration would be set to give the proper duration at overlap, not the other way around. If your cam suggestion of 236 @ .050 is on a 110 lsa, that would have 16 degrees overlap at .050 lifter rise. Soooooo, my thinking would be to get 16 degrees overlap with a 106 lsa the cam would have 228 degrees duration on both sides. You would have an intake valve closing 4 degrees earlier (better torque? vacuum?) and an exhaust cycle lasting 4 more degrees to gain a touch more torque.