Like Mopar Official said, three bolts around the mounts in car and four in trucks, and like he had also stated, it doesn't matter in the '68 to early Seventies if car or truck. IMHO, Chry-Co probably kept the cylinder walls thick in the first gen LA castings to strengthen the deck and increase torsional rigidity were it was most needed with the new lightweight casting design until it was mandatory to reduce the volume of iron used in production. Same reason first two years of 360 blocks were cored with super thick T/A castings. Most were used in trucks, motor homes, and C-Bodies.
