Engine swap conundrum

Thanks for the replies guys! The trans and rear end are the originals, but the original owner used the car as a drag car for most of its life. The trans is built, he put moser axle shafts in, front disc conversion, mini-tubbed the rear, moved the battery and washer jug into the trunk, removed the fuel tank and installed a fuel cell, welded in frame ties and put in ladder bars, and he said when he raced it he actually had a different 440 that he sold and dropped in the engine it has after rebuilding it pretty mild and sold me the car. So after hearing what you guys think it seems like numbers matching really isn't a big deal with this car.