318 LA rebuild after losing a valve seat

Wyrmrider said

if you can read the number on the crank someone will know what year and source it is

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Here are the numbers on the crank. I don't know if I mentioned it before, but the crank was a reman from one of the big chains. Ordered it for a '71 .030" under, since I hadn't realized the block was a '73. I don't quite know why I bought it .030 under, other than my old crank was .030 under. Seems I cut myself short of some life on the crank by doing that.

nm9stheham said

The balance change going from light to heavy rods is not all that much; I have made the computations before. It only changes bobweight by 20-30 grams. I don't think Mopar even changed the crank to compensate.
If this is the crank and rods that came in the car, then I would not worry over this matter. The crank is a cast one and that was what was used with both size rods from what I have been able to gather.
These pistons and pins are weighted to be used as direct replacements with no re- balance.
So this combo ought to be as good as factory balance.... Which is not to hotrod standards but it is not 'off'.
OP, what do you mean by TTY fasteners? Stock parts are not TTY.

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Yes, this will only be a mild build grocery getter. I doubt I'll ever take it to the track other than to watch other people race :D The rods did come with the car when I bought it (crank is new/reman) , but I'm certain the engine was swapped sometime before me. Here are the numbers on the rods. For those with old eyes like mine, the number is 3418645. Also, each rod has a different combo of letters, like CNC, ANE, etc. What does this mean?