the 500 came in 70-76 Eldos and 75-76 full size in most swaps you will need the rear sump pan which is off the Eldo motor sometimes you can get by using what is refered to as a 3/4 rear sump from a 77-79 425. The only sure way to tell a 500 from a 472 is check the stroke, 4.060 for the 472 and 4.304 for the 500. vin number will work if its the original motor. In the 71-76 the fifth digit of the vin will be S for 500 and R for the 472. For a web site with a lot of good Cad info
www.mts.simplenet.com He's a good guy to deal with and has a wealth of knowledge on the Caddys.
