i'm assuming the car ran previous to this work?
cap / rotor / plugs / wires don't have anything to do with cranking speed.
when you say you replaced the distributor, you mean you actually pulled the entire old distro out, shaft and all? a Buick Big Block ( 400 / 430 / 455 ) distributor can be used in a Buick Small Block ( 300 / 340 / 350 ) HOWEVER they use a different tooth count on the gear at the bottom of the distro shaft.
i would think that wouldn't be the failure mode for a mismatched gear set though.
have you checked the battery? are you trying to start this hooked up to a charger / starting box? do you hear the starter spinning or is there no noise at all? do you hear the solenoid actuate when the Bendix is supposed to be kicking the starter gear to engage the flywheel?
you can normally take the starter and battery to a parts store and have them check them for free. if those are nominal, you're probably going to need to go through all your electrical connections, fusible links, etc and make sure they're all good and all the contacts are de-crudded and tight.
67 chassis manual should help with trouble shooting and chasing wiring:
https://www.teambuick.com/reference/...ssis/index.php
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