I ran across a 1969 dated JD Coded 396 375 HP with 840 Heads dated H37 and I56, Black Steel Tuftrided Crank, and 3933163 Winters Intake if anyone is interested.
I sent it it to the machine shop yesterday for a Valve Job and Cylinder Cleanup and Magnufluxing.
I told them not to deck the block so as not to lose the numbers.