430 SBF with Edelbrock SC1 heads and 11:1 compression. Pure race motor on Methanol. New Garrett 5020r-88mm twin turbo's should allow me to make over 40 lbs boost. SC1 heads have efficient chambers so I think they require less timnig than other heads. My base timing at zero boost is 28 degs. What sort of ballpark timing numbers should I be looking at with 40 or 50 lbs boost? Just trying to get an idea before I take the car to the track. I will of course be reading the plugs I simply have no experience at the 40 lb boost level. My previous turbos only made 25 lbs max on my combo. I'm also using Holley efi.