Hi. The reed valve setups that I looked at in the late seventies and early eighties were to combat turbo lag. If I were to do it again I would install a Holley Sniper EFI on my Offenhauser 4bbl intake as a blow through, it is pricy$$ but it solves alot of problems and is tunable to boot. The turbo I used had no problem when I closed the throttle at the finish line at 5200 RPM as a draw through the carb..
