info on caddy use and also nitrous
http://500cid.com/mts/cat/tips.html
"The Cadillac 368 through 500cid engines were produced in various displacements from 1968 until 1984. Displacement of the engine was varied through bore and stroke changes. External dimensions of the entire 368 - 425 - 472 - 500 Cadillac engines are identical.
Most performance use is concentrated on the 425 - 472 - 500 inchers. In stock form theses engines are perfect swap material. A 500cid Cadillac engine weighs about 595 lbs. complete. Change to an aluminum intake manifold and it reduces it by 22 lbs. to lower the overall weight of this engine to about 575 lbs. Big cubes with the weight of a small block!
Use of the Cadillac engine dictates a close look at your vehicles total combination. Most people are not used to the huge amounts of torque the Cadillac produces. The Cadillac big block prefers to pull against a low numerical rear gear set. Most strip only applications only run a 3:73 ratio. Most street vehicles work well with as low as 2:73 to 3:55 ratios. This big boy wants to "tug" not "rev". Keep that in mind and your engine will live longer and perform better.
"Same as stock" engine use is also a very broad term. A stock 500 Cadillac engine will take a 150 hp shot of nitrous oxide for a full quarter mile pass. We have used many engines like this. Some with over 200 nitrous runs! Pop it in drive, nail it and let the trans do the shifting. You will have a deadly, repeatable combination. It will be simple, inexpensive and consistent. Your competition is going to hate you."