alex wrote:
What would be your combination of choice if around-town fuel efficiency were the priority of the build?
It would really depend on what I was delivering.
For simplicity, reliability and general ease of construction, I'd lean towards an old panel van (don't care what make) and drop in a base-spec GM E-Rod V8 w/ a 4 spd auto. Combine with a Vintage Air HVAC set-up and maybe $500 worth of ICE and you'd have a fun and comfortable delivery truck.
A 4BT idea sounds great and I've seen some cool builds, but I'm not sure I'd want that level of "project" for a truck I needed to rely on. Also, a smooth running engine it is not (compared to the 6BT, which I know for a fact is no smooth runner itself) and that could get tiring after awhile.