Welcome DD... good looking engine,can't add much to what spare and the guys have already said.
I have an earlier model of same engine, as already mentioned find the weep hole in the water pump housing..it's at about 7'oclock on outer edge facing eng. might want to poke a toothpick or soft wire in it to clear any crud that might have it blocked, run engine and check for leaks.
I used the Pertronix II ignition and Fiamethrower II coil. Up sized plug wires to I believe 8mm for hotter coil and gapped plugs at .040.
These engines had some weak points but with modern upgrades, which you already have most of, are strong running and economical especially if you do your own wrench turning. Any questions just ask and someone here will have an answer...great bunch of folks.
