Oh yeah, are you looking for 250 whp or chp? Have you been in a high power AW11? I'm running around 180 crank in mine and it's a riot; super easy to get yourself into some serious code brown if you aren't careful. Don't forget that these cars are ~2350 lbs ready to drive, they don't take a ton of power to move.
Manon Racing makes turbo kits that will support that much power. You'll then need to build up the bottom end to handle it. 250 crank is doable with the stouter 4AGZE rods and a set of forged pistons. You can probably get away with 9:1 compression if you keep your squish gaps tight and your tune doesn't break anything.
You'll then need to sort out all of the intake piping, intercooler, intercooler radiator, the rest of the exhaust, wiring, engine management, heat management, and a bunch of small things I'm forgetting at the moment.
You'll also need to think through a transmission upgrade, or be 'ril careful to not launch the car. The stock C50 has a couple of weak points in the differential side output shaft bearing, and the 4th gear section of the input shaft. Newer C56 transmissions from the silvertop 4AGE's are stronger in these areas and should be good for 250 crank as long as you're not wanting to do drag launches.
At the end of the day, $8k will be tight on getting a 4AGE up to 250hp if you have to farm out any of the required fabrication work yourself.
The pop ups/ad situation at mr2.com has gotten pretty out of hand, but here's the turbo build thread I wrote up over there. Click at your peril :\.
By (one) demand here's the build process for my 4AGTE My goal starting out was 170 crank horsepower, stock driveability, and because it's Texas I want my AC. I also wanted to keep the exhaust quiet as I'm getting old and I grew tired of having a loud exhaust a while ago. I also didn't want to...www.mr2.com
A 1MZ swap would be right around there, I think they are supposed to be 190 at the crank. Mine cost much less than $8000 to build, I did everything myself in my garage at home. The car is a blast to drive now and hasn't given me any trouble at the track.Appreciate the info. If 180 is a riot maybe I start with that.