Tom,
Just a note to say I've moved your question over to the
Paint and Body Shop as I think your issue with body and front clip arrangement/alignment better fits into that forum.
More to come soon I am sure as folks get signed in this morning and see your question!

PS - I will do a bit of "parts" searching as I seem to recall reading there where two different length "radiator support assemblies" for the 1941-46 trucks.
