Engine "85 flat tappet 302 guts to "95 block

Probably not a direct swap.

If the 85 block was setup for a single pc rear main seal, the crank should fit. If the crank is an older two pc rear main seal, I don't think it will fit in the 95 block. Check on this.

If you are using a mechanical fuel pump, you will need the 85 front cover to mount the fuel pump. Block does not matter.

If you use flat tappet lifters, then the flat tappet length pushrods should fit. The roller cam pushrods are shorter because the roller lifters are taller.

Also make sure you have a block with a dipstick hole, and, or plug the unused hole in the block or oil pan if needed.

Check that the oil filter adapter on the 95 block works with your oil filter or use the older one. My 97 block was from an explorer and had a different oil filter adapter piece.

The dist drive gear will have to be the correct one for the cam, flat tappet or roller, block does not matter.

I am building a 331 based on a 97 block, with all new crank and rods, but using everything possible from the 78 block based motor I had in the car. Its a learning experience.