68-69 B body info needed...

I believe the vin starts with RM for 69 Roadrunner designation.
Thats it. Being a 69 it will have the vin on block and trans IF original. Yea right!
Will have some vin on what radiator support, under seal of truck at gutter.
I had a MOpar bud decades ago, called and said he had a 69RR for me. It was bought new and been in that county its whole life. Had the original engine!!!!!
He also told me he knew every single person that had owned it those 25-30 years , and he knew it had gone thru 6-7 motors ( atleast) ,just happened the last time it was united with its original block!!! LOL