I still stick with my thoughts from page one that the 205's are fine with the 'R' intake (either would be fine, I figured the longer runner might work better for your RPM range, but whatever.) Obviously you'll need a cam to compliment whatever you choose - so you basically had the right idea in your original post (us going around in circles for 3 pages aside.) I just want to describe what I've done in a heavier than typical Ford as it might be helpful.
I have a 3630lb '87 Cougar with 3.55 gears. Your truck with 4.10's and 33" tires is about equivalent to my car with 3.23's, tho your truck may be up to 800 lb heavier from what I've read.
For about 10 years I had a 306 with AFR165 heads and a Kenne Bell blower and it was absolutely the kind of engine you'd like to have in your truck right now. Yeah, it only made 450HP, but from idle to 5k RPM it was an animal. I remember looking down and to the left when I launched (drag radials @ strip) because the frame was twisting. After subframes I was told I was wheels up on every launch even though I launched conservatively after breaking my (very expensive) E-Locker. I also broke things - pistons at first, then a rod bearing whereby I finally thought it would be nice to have torque and power, without the heat (meth/H2O injection), weight and hassle of a supercharger. The new 427w is cool, though it has a few drawbacks.
It's a Dart based 427w, 11:1 compression AFR 220 heads, SV intake, custom streetable premium gas cam that has been dyno'd at 630HP @ 6300 RPM, 570 lb-ft of torque @ 5000 RPM. No replacement for displacement. The engine weighs the same as the 306 w/KB, so no gain or loss there. The first notable drawback is that even with an aftermarket tuner and enriching the off-idle mixture to keep cam surge to a minimum, it still has no operating point between 1000 and 1500 RPMs. Probably fine for an auto with a higher stall converter, but a little annoying when tipping in while cruising with a 5-speed, though I've got it 99% there so long as RPMs don't drop much below 1500. The other issue is low RPM/cruising torque. Compared to the KB 306, it's kind of a dog. The cam doesn't really start to hit until about 3500 RPM, which is expected based on the RPM range it's designed to make power at. Now down shift and bury it and you'll be clenching your butthole, it gets too violent for the street. My reason for hedging in the posts above is because of this - if you want smooth idle - 3000 RPM cruising performance, you will be giving up some of the power potential of the heads - possibly making the added potential of the larger heads mostly unused. The thing I probably need is gears to get the engine into the torque producing RPM band sooner, but like you I don't like cruising at high engine RPMs. We'll see if I can get it off the line at the dragstrip next season.