The whip lash cam you are set on is gonna waste a lot of fuel, too much overlap.

As for the too big of an engine complaint, just gear it higher it has the same effect.

A long stroke does not give any more TQ than a big bore engine of the same displacement, this has been proven a myth many times. It can mean you are getting a shrouded valve by the bore so breathing is limited making the engine a lower RPM type engine but if valve shrouding is not an issue then the bigger stroke does not make a difference.

A longer stroke will have more leverage on the crank but less surface area on the top of the piston for the pressure to push on, those two forces seem to balance each other out both theoretically in the real world. The real difference in big bore VS long stroke is valve shrouding.