your thoughts on a street cam
As said, that makes it easier to go with a larger duration; you can rev over a dead torque range when taking off. But you can still kill it to where it is truly dead below a certain RPM; keeping the DCR up as noted avoids that.
What you do end up fighting is the RPM range if you go too big: With certain large steps in manual gearing, you can drop into a dead RPM zone with too aggressive a cam and a long gear step after the upshift. In general, I would also be thinking about where the top usable RPM will be with the stock head flow (and other parts like intake and exhaust), and with the tallest gear step (1-2 or 2-3), see what the low RPM is right after the upshift.
But, off the cuff, I don't see any of the durations you list as being quite so big as to cause this problem; you're just gonna slip the clutch more with the higher durations. So that kinda brings up the age old question: how will you being using this combo?
FWIW, I had a 4 banger race engine with a 300-ish (advertised) duration cam and a miserable DCR that made the usable RPM range 3800-8000 RPM.... that was indeed a problem on the 2-3 shift. A 2:1 usable RPM range is not very useful in most applications LOL.
