he said all motor d series were out of the question for a 300+ hp buildi would work with the d series u have now assuming u have a D series and just build it up and turbo. You can deff reach 300HP in a SOHC dont know what that guy was thinking when he said their out of the question when you see them everywhere. D series are starting to make a come back in my opinion so i would stay with the D series. Just my 2 cents
whats going to have mor torque at 300hp a b series or a d series?