Did early 261's have side motor mounts?

I know the early V8's didn't have side motor mounts, they didn't get them until 1958. Are the 261's the same?

I have a 1956 4400 with a 261 (casting number 3769925) and no serial number stamped on the pad. It has three bosses on each side for motor mounts, does this make it a transplant? Would this be the "FULL FLOW" motor?

Thanks,

Mike B smile

Mike Boteler

1956 Chevy 3100 Resto Rod
1952 Willys M38 Army Jeep
1983 Jeep CJ7 Laredo
1984 Jeep CJ7
+++++
Silver Spring, MD