I understand what you are trying to achieve, I just don't see how a few more ft lbs of torque and a couple of ponies at a lower rpm are going to overcome the 11-12% under gearing you have now. The .020 bore and O/S head will help, as will the header, but I have yet to see any engine mods to a 22r replace the performance lost when being under geared.
With the engine mods you have done/plan to do and 4.56 gears you could likely tow the trailer you are looking at w/pleasurable results, but with your current tires and 4.10's, I don't think you will find it all that enjoyable.
The gains of the 261 from 2800rpm's up are nice, don't care for the drop in numbers between 23-2800rpm's though, maybe along w/better intake/exhaust set-up allows it revs faster so that the lower numbers don't effect the performance. 
Do you have the numbers for the stock cam and DT header?
Hi Snowtoy,
Well, perhaps we can agree to disagree on gearing change vs power increase.
Yes, I have numbers for stock 22RE and 22R with DT header.
Gnarls.
