This bellhousing adapter allows you to bolt a 1984 to 1992 Chev S10 T5 onto the 1947 and older 216 floor shift bellhousings. The column shift 3 speed bellhousings were different. Those plates are also on Ebay.
We are unsure of what year the floor shift bellhousing changed. I know that 1947 and older were the same. The column shift bolt pattern changed between 1954 and 1955.