Stock computer/Stock tune Datalogging?

[Fast355]

Move the MAP sensor vacuum hose from the rear port above the IAC to the front manifold vacuum fitting on the throttle body. The Holley 670 TBI units have an issue when the MAP sensor is connected to the rear port. Your setup is going to want more than 12.5 PSI. I would try around 15 to start and it may want as much as 18-21 psi once you dive into tuning. I know this is abit of a bandaid fix to get it driveable, but put some timing in it too. Set the distributor at 6-8* BTDC with the timing wire disconnected and bump the fuel pressure up as high as you dare. The stock pump will likely only support up to 15-16 psi before the internal relief opens.