Getting more power.

Okay here's an unusual case... (I think)
I have a 1979 Cadillac Sedan DeVille. 425ci Carbuerated. rated at 180 HP 320 lb/ft torque.

I'd like to try and open it up and get more power and torque, I know the engine is capable of it, I just don't really know what should be done.
I'm getting a custom exhaust made and since I don't need emissions anymore (25 yrs old) I'm going to get it as free flowing as possible. This should help some, But I'm sure there's more I can do.
Don't tell me to sell the car and buy something new I wanna do this just because it'd be different.

I really didn't know where to post this but I figured people in here might know there stuff so maybe it was a good place to start.
Anyhow any ideas are welcome (except for me to sell the car) Thanks in advance.

theres alot of stuff you can do, get higher comp pistons, get new heads that flow better, get a bigger cam, get a more high flow intake manifold, get a bigger carb. first i woudl start out simple, free flwoing intake filter, liek a k&n filter, headers, more free flowing exhaust

first thing I would do is get a bigger carb, the one that thing has on it right now is probably tiny, it will kill any gas mileage you once had though.

Get a 6 pack and throw it on there, that'll give you some nice power.

i agree, anything really can be done with time and money. id start with an aluminum intake manifold as well as a new Carb setup, like a 500cfm or higher, then go with a new high dome piston and camshaft, even a lighter set of pushrods/valves/rockers will free up tons of lost power.

Thanks for the ideas so far :)

And gas mileage.... I don't worry about it really, I get 8 or lower as is soo what's a few less gonna hurt? :P

Now to look for stuff that fits :)

After the simple modifications have been done..headers, air element, etc., I would go and look at the compression. From what I've heard those cars had pretty low compression. Changing heads would make a world of difference, but you could also just deck the stock surfaces to get a little more compression, if needed, anyway. Next thing would be cam. This is going on a guess that you don't want to pull the engine from the car and rebuild.

You're right, I don't want to yet, I'm still using it as pretty much a daily driver, But once I get another car, then I'll be going all out, So anything is possible.