Everything said above is true, very high nickle block and they perform well when hot rodded. The stock rods are cast and should be replaced with affordable aftermarket forged pieces if you want to run it up to 5500 often.
I'm in the process of building a '75 508" engine for my '32 Victoria, wanted something different, learning as I go. You can look at 2 websites....www.500cid.com
(Maximum Torque Specialties) and www.500cadparts.com
. They both carry parts to really wake up the 472/500 Cadillac.