Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
Are you in a state that has mandatory emission testing?
Ok, I know one thing, you will have to go with the mechanical fuel pump cause a carb only needs like 7 psi and that fuel pump in the tank puts out probably about 50 psi.
Are you wondering about the fit? Also, the transmission is electronic and will still need the computer. I think what you should do is search the internet forums, etc for someone who has already done it and see what problems they might have encountered and what they did to get it to work. I'll see if I can find someone.
Here is a page titled, "Engine Swap - small block Chevy into '06 CTS - Cadillac Forums"