I find 66/7 b bodies are best for shorter people because the dash sits lower in the car and are flat.
68 to 70 b body dashes have more of an angle up and back towards the driver.
71 and up B and all E sits the driver lower to the floor and the dashes have a very sharp angle up and back.
I find that 66 /7 b bodies are often the cheapest of the bunch. I just bought a 67 Belvidere at a bargain price. 68 to 70 B's are gold and E's are forget it.