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Welcome from Georgia They will measure the crank and rods and other bearing surfaces to determine if they are worn and need overbore or in the case of the crank They can polish the crank journals slightly smaller to remove the scratches and use slightly thicker bearings to make up for the material they polish offMight be cheaper to buy a crate engine that’s all new and assembled and ready to run
That's where I was going Stew; it wouldn't hurt to balance the crank and match the weight of the pistons while you are here Captain. If it's a manual transmission, have the flywheel balanced too. Makes for a smoother running engine when all parts are in sync and not fighting each other. Regarding the bearings, you won't know till the crank is measured by your machine shop. You may get to use standard size 350 bearings, you may have to have the crank ground to the next size down. Welcome from SoCal, you will find this site very helpful.
Aye Captain! Welcome to the world of Big Block power! Sounds like the motor is frozen from sitting. Try some PB Blaster in each spark plug hole and use a crow bar to gently move the flywheel till you break her free. Careful using the the words "big block & performance" - big money will follow!