I can't believe your bullshit detector didn't go off with the copy and paste specs that are not even correct.
Seriously - this is a recipe for cheap success
Junkyard shortblock - ~150
Junkyard GT40 heads - ~75
Cylinder head seals, lapped valves and seats - ~ 200
351W Re-ring kit - ~ 150
--------------
Shortblock machining and assembly costed me around $350 - I got the engine and placed the cylinder heads and intakes on it and fired it up.
Either find exactly what you need without having to tear the motor apart or start collecting parts and search for a machinist. They are easy to find - get on your local Ford based racing/mudding boards and see who is having who build engines. Usually there are a few go-to guys in the area who build great motors. Call em up and let them know what you want - that way you get exactly what you want.
... or you can just cut a check <flipoff>