John,

When I looked into this question some years back here is what I found for 70 B body jacks:

1) St. Louis plant = tube style ( except for Charger)
2) Lynch Rd plant = T style
3) Los Angeles plant = Tube style

I hope this helps.

70 Road Runner 383-4 4 speed FJ5 & black guts
70 Charger R/T 440-4 4 speed FJ5 & white guts