318 and which cam?

Funny enough I just came across a set of the 302 - swirl port heads. Guy says they need work but everything is there. Now I'm considering these for $150. Could be a whole lot cheaper and better performance than dealing with my 318 heads.

The same guy has a set of 340 J-heads (1.88 intake) for not much more $$. Anyone know which would be the better of the two to look into?