What are these two plugs?

Is there something different on the 65 and earlier slants than 225's or will his 225 bolt up?
It'll bolt up, it's just that the new 225 I have probably hasn't ran in 40 years. It is from a 1970 so I need to use a 170 oil pan and pickup (my old 170 has a hole in the pan and I'm guessing metal shards in the oil pump/pickup). I also need to use the distributor from my old motor because this one didn't come with one. And I'm definitely a beginner so I need to figure out timing.