Always neat to see an older Mopar that hasn't been "other-ized" under the hood. There's one guy running around in NE TX that has a '51 GMC pickup with a 302 GMC inline 6 with a modern 5-speed manual trans behind it.
Remember that before there were bent-eights, the inline 6s where what Lee Petty raced at Daytona. The gear ratio spread of the 5-speed probably makes it a nice performer, within its somewhat limited rpm range.
Thanks for posting!
CBODY67