Originally posted by "400HP930"
To run those kinds of pressures you should also lower your compression ratio to around 8:1.
You should also be able to get at least 400 HP from a healthy 5.0 running about 15 PSI.
You can run up to 9:1 compression with no problems.
Where did you get the 400 h.p. number from ? That may be the case for your air cooled beast. A stock 302 with twin turbos would put out well over 500 h.p. at the wheels. I have read about it more times than I can remember and that is with a stock bottom end minus a different cam.
Slap in a good long block with two turbos and 800 + is easy.