360 year identification help

I just picked up a 360 short block that a guy had stored since the early 80's. He said he took it out of a 79 volare but it wasn't the original eng. that came with the car. On the side of the block you can make out the month and day of 11 2 and the first number of the year is 7 but the last number of the year is impossible to make out. Could be either a 3 or a 8. I noticed it has the old style balancer (the one with the extra counterweight attached to the front of the balancer as opposed to the newer one that has a part cut out of the backside). This leads me to believe it's probably a 73. When it comes time to order bearings I need to know positively. The numbers on the left front below the cyl head are 3W 360R 4504. I don't know if this means anything or not but thought I'd add it. If anyone knows any way to positively identify it I'd appreciate it.