ATP Z196 will fit it. Heck I used one of these to mate a 1992 42RH OD trans out of a 92 dakota V6 pickup to a 1974 318. The crank bolt pattern, and torque converter bolt pattern were the same.
Z-196 will fit the 1968 and newer small block crank. The bolt pattern is the same on the early crank, as is the converter bolt pattern (904) but the center hole is a different dia.
PS: same applies to the slant six, but the crank bolt pattern is different then the small block. One hole is about 1/2 hole different.
