Quote:

code is on passenger side 3698830 but I need to look the date tomorrow. If I remeber then year was 73 or 74



Do you have access to a sonic checker ?

Sounds like the valley end rails were machined and info by whomever did it stamped on there. A 413 bored to 4.340 would be bigger than 416. The 416 is probably a reference number by the rebuilder.

What is the date stamped on the back of the bearings ?

Also the 060 may not be an overbore indication , better yet the block may have been decked that much. I had a 69 440HP that had the valley end rails machined and it was just stamped 020. The block was .030 if I remember right , I figured out the block had been decked .020 .