Should I try to start it

Well I am about to start a restoration project. I got a 65 Barracuda that has been in a barn for about 20years. My question is do I try to turn it over or even do a little carb work and see if it will fire. But I dont know anything about it and I am going to tear it down and rebuilt it anyway and I dont want to hurt anything inside. Mainly score the cylinder walls or something. It is a 340 with a Holley DP, I think someone was drag racing this car so I dont know how built the motor is. I pulled one valve covers off and it looks really clean under those. I dont know if I should just pull the motor and tranny or get some oil flowing through the motor and try to start it. What would I gain by doing it?

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I would take the plugs out squirt marvel mystery oil in each cylinder, a fair amount. Let it sit for a few days resqirt it and see if you can turn it by hand.Check or change the oil in the motor probably change it since it's old,clean the plugs , Pour some oil over the rockers and lifters and start it. What have you got to loose?