Agree with cj428mach. Intake is a 390 - 4V intake as denoted by the "S". Heads are likely C8AE-H (castings are not always perfect so check the other one) and either 8 or 14 bolt on the exhaust flange. If original to the Fairlane it would be 14 bolt same as Mustangs. CJ's would be C8OE and have 16 bolt flanges. With all that in mind it is likely a 390 block as well, but all of these motors have a story and are likely not as they were first built. As others have mentioned, the C or A scratch on the back bulkhead is a giveaway for a 428 block. Without it you almost certainly have a 390. You would need to pull the freeze plugs and look in the water jacket for a 428 stamping and/or measure the bore and stroke.
Not to say it isn't worth picking up. I would pull the valve covers and get the date codes off of both heads, check the block (below the oil filter adapter) and intake and post back. Look for something with possibly a 7 or 8, letter and number. For example, 7A15 would be January 15, 1967. Hopefully they are all within a couple weeks of each other. Having pieced together a date code correct 390 for my car there are plenty of people like me looking for the same to match up with my car build date.
Good luck and nice score!
Last edited by SunnDogg; 03-03-2017 at 06:31 PM.