Couldn't one get a dog house from a 65-67 with big six and the cross members. Cut the floor to size and replace the crossmembers and drop the big six in?

You have to change crossmembers to put in a v8 and mod the dog house for width too.

Seems it should be a horse a piece if you have a Van. Does the dog house go to the rear of the cab in the PU?

I vote for the 300 or a Turbo 2.3 four from a TBird
Dan