340 Flywheel Help Please

I am getting ready to pull my engine out of my car to convert everything back to 4 speed! I am installing a 69 model 340 engine that is already completely finished.I want to make sure I get the correct flywheel for the engine and not something that is going to throw everything out of balance.I have a setup I was going to use but after getting the flywheel all cleaned up! I find there are no part or casting numbers on the flywheel at all.How can I be sure it is correct for my application.I basically have everything to do this conversion but now I am stumped with the flywheel.If someone has a good flywheel they will sell for a reasonable amount for a 69 model 340 engine or can direct me where I can buy a new one for my engine.The engine is stock I just want to put this car back to ORIGINAL AS I CAN! I just want to get everything I need so the swap can be completed over one weekend if possible.Or if someone has a flywheel,clutch and pressure plate I would be interested in the complete setup at a fair price.I just want to get this task completed before my other car comes in from Illinois so I can start on it as soon as it arrives.

Thanks

Bobby Dodson