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Yeah theyre pretty softly sprung on these ( and the 1uz too) but it helps to keep from loading the cams and helps make power by virtue of mechanical losses being lower.
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Thats very true, I just hope people dont think they can run those springs hard and expect them to hold for a long time as they will be surprised!
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Cant remember what the exhaust springs are rated at now...One other thing i noticed was the point of coil bind appears very close to the valve caps touching the stem seals. A modification of the guide bore locations could help get us a higher lift if the new cams make the engine respond to a lift increase.
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According to the tests done here int and exhaust were the same rate. At least the 5vz one. Also the part numbers in the pars catalog (toyota) showed them as being the same thing as well. You bring up a great point about how close we are getting to the valve stem seal....DANG i wonder what that number is as i have some serious cams that are going to go into my big 5vz-fe build here. I can also just get valves made that are longer which raises the retainer up by a bit.
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Should do well with it Johnny. How much to ship a 5vz block (bare) and heads to me? 
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The shipping will cost as much as the dang engine is to buy, but if you are interested let me know via email and i can figure something out for yea.
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Nice one matey, you clearly have a good grasp of the subject! 
One thing i was thinking about was the exhaust valve sizes. I havent crunched the numbers yet as it depends on the exhaust port flows vs intakes and what the ratio comes out as.
AId hazard a guess that a turbo app would likely benefit from a larger pair of exhausts if these are undersized, which if we check the intake valve vs ex % comes out as :29mm/34mm= 0.85 (85%)
We could go as high as 0.9 (90%) but we'll have to see what we get on the flow figures first and see if we can derive a benefit from going a little larger there.
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Another thing to look into for sure as i would love to provide a perfect matchup for people to buy stock size intake with a oversized exhaust. Something to look at as well, what i currently do is run a tad longer duration and lift to the exhaust cam for people who are running forced induction, this has seen GREAT results on my trd s/c 5vz tests (25whp vs 15whp gain with standard same duration cams)
I personally am just planning for N/A builds so my "specs' are going to be different then most of those FI guys