Welcome, definitely a cool wagon. I'd love to put one of those Ford 6's in my wagon to replace the AMC engine. Unfortunately, not a whole lot of tech went into straight 6's in the states. The 4.2L GM Vortec is the only modern one we have.
Straight 6's can be bought cheap enough, maybe should look into it. Have seen DOHC engines for as little as $400 ($au)