Long sitting 273, any ideas?

Real quick and easy to check. Drivers side of the block above the 3rd freezeplug back. will be a long number(7 diget i believe) followed by cubic inch and then another #. Example 2780930-340-2 Looks to me like someone put a 318 in your car. Block show any signs of red? If you end up needing a 65 273 or a 340 PM me.