IDing My K6 Block

My understanding of the time frame issue is that Chrysler initially complied with Title 49 only on HP engines. A friend's '68 Hemi Road Runner had an SPD of October 24th '67 (Inland shifter car) and had the partial VIN on both the transmission and the top of the engine's bellhousing flange facing up. Another friend's '68 Charger, built January of '68 at the same plant (Lynch) has no VIN stampings on its 318 or A904.

Now I need to check my '68 Hamtramck-built Valiant to see what, if anything, is there. Unfortunately, based on current weather patterns, that won't happen until sometime in July.