Will these heads work?

That is what I was thinking. But I seen some place that say it wouldn't work. I wish I can find the article I was reading. I can't even remember what I was looking for when I came on it. So the heads with the 2.02 intake are just J heads if the pushrod holes are in the sameplace as the heads with 1.88 intake? Are there alot of difference in preformance in the two heads? I would quess the ones with the larger intake would be the way to go?