Re: 1958 evinrude lark 35hp with video
Be sure to replace the t stat, it is essential in your cooling system.
Those plugs are toast, replace them with Champion J6C
Are you getting good spark on both cylinders? What is your tilt set at?
As Frank said, I would clean/rebuild the carb and be sure to use new packing washers. The packing nuts, 7/16" will tighten to keep the needles from vibrating loose.
Check out the FAQs for a thread for setting the needles.