My 5.0 blew up will a 289 from a 65 coupe bolt in

You can make it work.

There's no hole in the block for the dipstick, you'll have to use your oil pickup and oil pan, timing cover, all the brackets and probably a 5.0L timing chain set.

The 5.0L waterpump is a different length than a 289 unit, and you'll need a 1971+ 4-bolt 28oz balancer to bolt up your crank pulley.

You'll also need a distributor or a dist gear from a TFI dist without a roller cam. Firing order is also different than a 5.0L, unless they used a 351W cam. That, of all things, isn't really a problem though...it won't quite have the 5.0 sound, but it works just fine.

Check the bell housing bolt pattern. Early small blocks had the 5 bolt bell housing and will not bolt up.