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Even though they are new, you might have a bad plug wire. The core could be broken internally giving a good ohm reading but not being able to handle the voltage needed to fire the plug.
An ’59 18 horse almost drove me over the edge trying to figure out what was wrong. it had a whole new electrical system but it missed badly at the lake under load. I finally figured out it was a bad/broken plug wire. The solid core wire I used was at the end of an old roll of FoMoCo wire and I remembered I could hear it cracking as I took it off the spool. It checked out OK with a meter but the core wire must have broken as I unwound it and it wouldn’t fire the plug. After several trips to the lake I decided to try some fresh wires and that was it. Problem solved.