What do you think of this plug?

It looks to me like the plugs are fine. Maybe have your choke pull off a litle faster if you have one, if you dont, go one step hotter. I wouldnt change much else. In terms of brands, I will run Champions if I need to with stock ignitions but typically it's Autolites because they last better with multispark setups, if it's a race engine NGK V Grooves because I find them easier to read and available in a lot of configurations and heat ranges.