What all will fit?

Here's what we want to accomplish:
12.8 ET
17+ MPG
All accessories to work: AC/cruise/OD/etc
Reliable enough for 800+ mile trips

Here's what we have to work with:
'02 Dakota QuadCab 2WD
She's got a 4.7 and the upgraded auto transmission
I can post the window sticker. She's basically stock-no performance parts
260800K miles

We have a couple of 360's, a mid '90's 5.9 shortblock, and an '85 318 longblock, a '06 5.7 out of a truck, and several BBM's.
For SBM: we have a set of 308's that brian6pac was working on before he passed. They're not ready to bolt-on, and not sure what they need.
A bare set of Magnum R/T heads
A set of cast iron Indy Magnum heads, they're almost done. No CNC porting, just cleaned up around the ports, and set up for a cam under .550 lift

We have a set of Indy EZ heads for a BBM.

I'd like to do the 5.9 NA for simplicity, and would do a stroker if need be...