Slant 6 to 318 conversion

Did Your 318 have a pilot bushing in the crank?
Was the flywheel balance correct for your engine?
Is the replacement trans also an A833overdrive?
Will the shifter levers bolt on correctly?
Did your BH come with the correct fork and Z-bar, and anchor?
Does the Trans output shaft fit your Driveshaft yoke?
Did you transfer the speed-O-gear over?

If you installed a V8 3-Finger BnB clutch, You may encounter excessive pedal effort. If you do, the proper solution is to Swap out the pedal-box to one from a V8 truck. Second best is to modify your pedal ratio.