What do I have? 340 decode

Trying to find out what I have. Supposedly came out of a 70 duster.

2780930-340-6 Engine is painted that blue green, not orange, so that got me wondering.

The trans is supposed to be a 727. There is 432-4 cast on both sides of the bellhousing and this stamped above the dipstick tube 1B162500.

I'll try to get the casting date off the block. (read some more threads!) Any thoughts?

First of many learning curve questions I'm afraid. Thanks!
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