i had a mild 340 in my dart with a singe turbo making 640rwhp on 10#s and 93 octane. after it let go i built a 416 and it made almost 1000rwhp on 17#s and 93 oct... here is a video on the dyno with the 340...
Frania Fabrication 1971 Turbo Dart Swinger Dyno#1 - YouTube
