"......Something I always wondered about... Using the turbo425 transmission from a big Eldorado or Toranado with a 500 Caddy or 455 Olds in the back of a Kelmark GT kit....."

I seem to recall Hot Rod Magazine did a wrtie up on a 455 Kelmark, as I rememeber it was kind of a monster.

In certain ways you can draw a lot of similarities between the big Caddy engines and the early Chrysler Hemi’s. Almost every Hot Rodder has heard of them, there is a fair amount of misinformation about both, you don’t necessarily come across a lot of them anymore, even if the initial cost of the engine is low they are an expensive engines to build. Even with only a few companies supporting either engine there really is a pretty fair amount of good aftermarket performance equipment out there to build the engine to suit a particular application if you know where to look.

I suspect the main reasons you don’t see more of them used is the cost to build the engine and that putting one of these in something is a bit more of a challenge. These engines are wide and tall and specific swap kits are not readily available so putting them in certain projects can take a fair amount of fabrication skills and experience (but that is true with a lot of swaps).

Having gotten into these engines a while back I am aware of several ongoing caddy swap projects plus I've read of many completed cars (putting turbos on these seems to be coming quite popular). They are being built, you just don't hear as much about them.