If you have 14 x 5.5 inch wheels, the discs should fit. If narrower than 5.5, probably not. And if 13 inchers, definitely not.
Check the spark plugs. If they have tubes, the engine is pre-1975 or so (can't remember the exact year). If it has no spark plug tubes (the so-called peanut heads), then it is newer. If it has hydraulic lifters, it is something like 1980 or newer.
There will be a casting date on the driver's side of the block, but I think it is hidden behind the exhaust manifold. There are stamped numbers somewhere, but can't remember where.