milling heads for comp ratio increase

According to many people, and some here I have read on this forum, these are just junk 318 heads, nothing special. Maybe true, but they're all I have with my budget - I have another 318 and two 340s all needing cash thrown at them also.
Now this is where I'm going to have some trouble making sense? You have two 340's and a 318 and 273 and you want to spend the money on the 273?