www.rsmracing.com
www.cadillacowners.com
97 Eldog's to my knowledge do not have mass air flow sensors.
You don't need injectors unless you have something that requires more fuel (ie turbo, blower).
You can always do a wet kit (no dry kit cuz no MAF). I'm loving my nitrous setup

(PM me if you want more help on a nitrous setup, as I just finished mine on my 94 seville STS).
I did a free exhaust mod which involved bolting off from the cat and back. It sure made the car loud but man did it help.
I made a custom intake (see my other thread and read down some past my 1st ghetto intake).
I might pick up the RSM Racing ported throttle body. I've heard some good reviews of that.
You could always port the heads or something using a dremel or a die grinder or pay someone over 1k bucks to do it for you (boo).
Other than that, I'm currently searching for mods as well.

Anyone seen parts for rebuilding the engine or stroking it?