my slant wont turn over!

Not directly responsive to you, but since you are working in the relevant area, now's a good time to mention that you must have the 1/8" annular spacer ring between the '68-up large-bore crank snout and the '67-down small-nose torque converter, or you will eat transmission front pump bushings and seals and may very well have "incurable" powertrain vibrations.