Motor Swap

As there is a wealth of knowledge on both sites for the slant six I wanted to post this here as well.

I Was doing a super six swap and I recently found out I hav a cracked block directly below the exhaust manifold and need to take the original 225 motor out of my 67 dart. I have a 225 out of an 1981 D100 I plan to put back in. Looking for advice on parts I will need to transfer over from the old motor to the new motor. I hear there are issues with the 904 transmission and crank pilot hole and I need to locate an adapter? I do have a 1971 transmission in the garage that I can steal parts from if needed. Also, the oil pressure sender is different. Is that an easy part to switch or do I have to change the whole pump?

Looking for some basic do's and don't do's and if there are any upgrades/maintenance items I should do to the new motor before putting it in.

Thanks for the help!