Why are 318's low HP and torque?

Are driving this car now? If so start with the rear end and gears swap first it will make the leaning tower of power a little more fun to drive until get the 318 ready plus stock rear end won't last long behind the teen my 5th Ave lasted just over a month. You said you tore down the 318 already how far longblock? Shortblock? Fully disassembled?