408 Build-Up

There are tons of companies that make a 408 stroker kit. I went with DSS on mine.
I went with Total Engine Airflow to CNC my Twisted Wedge heads and they flow awesome and make tons of power. Depending on what you want the car to do and where you want your power at, look into custom cams, and a good head. Both TFS and AFR have done nothing but impress me.
Also I went with a carbed setup on mine and kindof glad I did. I have awesome throttle response and I can adjust the idle to work my large cam. If you do stay with EFI then your going to have to look into a custom chip and possibly a different computer all together.
Only downfall I have found with my carb is the cleaning of it and it does need to be adjusted from time to time. Unlike your EFI. I also spent a lot of money on my carb though. I didnt go through Summit and just order one and bolt it on. I had a shop build one for my motor specifically and it works great.

Never had it dyno'd but probably 500-550RWHP, and I get about 7-10MPG? Ive never figured the mileage. All I know is that its terrible.