So we've got an asphalt track about 160 ft. in length (track length varies month to month by 10 - 20 ft. ) 5 minute racing

10.5's run in the low 70 laps with times in the low 4's high 3's.

Having that bit of info what do you think would be a good rollout starting place for a 13.5?

I can say - I did a little running and choose a 100/52 ratio on 2.2's - the car was nice to drive and if I could have put a solid run together it should have run 67 laps...I did a 65 5:00 up front laps were 4.4's and last lap was a 4.5 so I think I could have gone up a bit more. Car needed to be freed up just a tick, but it ran pretty decent.

That rollout (~3.60) sounds pretty reasonable to me, as a starting point. I have not raced BL on flat asphalt though and I'm not sure how carpet compares to asphalt rollout wise.

360 is what I ran...it felt pretty good, but I'm going to try going upto about a 370 maybe MORE next time...