Alexi.....The Caddy El Dorado front wheel for one used a rear sump oil pan...You will need the oil pickup and screen to match...I'm undecided between a 500 Cad or a 350/403 combo Olds in a 70 Chev stepside project....A 455 Olds is almost ready for my 72 C10..My 69 C10 is getting a really healthy 292L6 INLINE of course..!!.....