Jim,
I have the data plate numbers. They were on the door frame.
Row 1 is the serial number i believe
Row 2 said model, axle, tranny, paint (I don't know the original color because it was painted as a service truck.) etc.
Row 3 was weight, horsepower, rpm etc. But rows 2 and 3 had some blanks.
Here are the numbers:

L10SH181477
090 M L104 A 02
04350 079 4000

I have only seen one other 60's Econoline but i do not remember if it was a truck or van but it was yellow and it was somewhere far away when we were on a trip. I am located in central Ohio. Thanks for all your help.

BTW, Thanks Bdox for the idea on how to break loose an engine. I think we are first gonna try taking off the rocker arms so the valves are closed and pull out the plugs and fill it with ATF. The pressurize the cylinders with air. Had three guys tell me this so far two had heard of it, one said he had success with it on an old IH diesel combine engine.
Thanks again. 4020FarmBoy