Rudimentary valve clearance question.

Yea, a couple people have mentioned that duration will kill you quicker than lift. I was also thinking I was safe in the range you listed, but I play it safe and am considering around .540 or .550 with not too much more duration than the .484 cam. I will only have 10.1 compression after decking the heads, so I can't go too wild. I have also had time to check the other cylinders and they all check out near the same clearances .220-.230. Thanks for all the info.