gas and octane question

Thanks for all the information. My engine was professionally rebuilt when I bought it in January and has less than 1000 miles on it. It has an Edelbrock 600 CFM and a Weiand intake manifold. I would guess that the exhaust seats would have been replaced to accommidate unleaded gas. I got the old Moroso valve pan covers and the commando air filter with the car, so I'm guessing it was original. Now the engine has the Mopar performance air cleaner.

Joe