'68 318/727 vs 340/727 trans mounts

All tranny mounts for the 67-72 A bodies is the square mount. 73-76 A body had the spool mount. U can use a 73-76 crossmember and mount in ur 67-72 A bodies. The bolts to secure the crissmember in ur car are 9/16. The 1970 up use 3/8 bolts. U just need to enlarge the bolt holes in the newer crissmember. Kim