That's all I can think of. The Mopar 400 is a nice big bore with a fully skirted block. Stroking them to a 500 is easy. The Caddy 500 is a good lightweight high-nickel engine, but you'll spend a little more getting it to spin (if that's your intention) The Ford big block is an excellent choice since it fits, but if you're going to spin it fast, just know that it does not have priority main oiling. Its a good candidate for a high pressure pump and some quality machine work.
Some people make 502s using bowtie blocks and going 4.470" on a stock 4" stroke, but the easier way is to stroke it.