318 LA rebuild after losing a valve seat

pt70 said

After you choose the pistons, I'd bring a piston, rod, rings, piston pin, and rod bearing to a machine shop and have them check the crankshaft balance to see if it is close.

Measure the crank end play before putting the cap on. It should be the same after you torque the cap down.

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Well ****. The crank is already installed. How crucial is it to check for balance? FWIW, the crank I bought was a reman supposedly for a '71.

I'm not keen on removing it because the fasteners I used are torque-to-yield, and they weren't cheap. From what I understand, TTY fasteners should only be torqued once. At the risk of beating a dead horse, this is my first rebuild, so everything here is a learning experience.