dialing my 318 in finally!
I may disagree a little with "cracked" as far as the timing curve, considering you seem to have a pretty high compression ratio.
After rereading the thread this morning, i need to backtrack just a little on the above statement. I like the numbers as far as it should be able to run good with the one's you used, but the curve itself could be brought in a little earlier.......Maybe starting and totaling approx. 1000rpm's sooner.
As far as the power valve, it allows leaner metering during the idle and cruise operation, and then allows a full fuel load during heavy acceleration. The general consensus is to use a opening rate with 1/2 of the idle vacuum produced. I personally prefer a little tighter spread on moderately cammed/vacuum combinations. Just keep in mind, it's either open or shut, and as long as the majority of your driving, except heavy throttle, keeps it above that vacuum level, a higher opening wont be a issue. It basically just lets you get to power enrichment with less throttle opening.
There is another member here dialing in his carb that has a proform body, and i'm coming to realize the jetting requirements tend to be a little different because of air bleed sizes, so i shouldn't comment on specific jet numbers.
One last thought. If you do change the timing, do that first and then proceed with the carb adjustments. And, i'd lower your float adjustments to just a trickle at the site plugs before really fine tuning the carb.