You've likely got an electrical fault bleeding the battery. You need to locate where that is happening. Likely suspect would be a fault in the alternator which wouldn't show up by removing fuses. Another possible would be the injection pump solenoid. If not wired correctly that unit can drain the battery. Those are the two most likely suspects. That current draw is pretty severe to bleed the battery so fast. One problem I see on that build is there's no intercooler. A stock P pumped 4bt always had one and if this one has been turned up any at all you're fighting against heat to make power. With any kind of boost level at all from the turbo, the compressed air can reach 300 deg F or more. Hot air makes poor power. Also, looks like that engine has a.n H1C turbo which is not what a P pump used. It should have an HX30W. The lack of an air cleaner system is a death notice for the turbo plus you're sucking hot air off the exhaust manifold. Here's a photo of what that engine should have looked like on the turbo side on an original install.
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