318 low budget heads change

Hi,

I hope it's not because I did not research properly, but did not find an answer to the following question.

This winter I will be working around the heads (intake + headers), so maybe a cheap head change would be worthed.

I have 3 choices, would like your input on if worhty or not:

1 - 1978 360 heads - free
2 - 318 casting 302 - 125$ / pair
3 - 340 casting J (don't know the year) - 250$/pair

All of those are complete, would reuse the valves, but change the seals and use a set of thin head gaskets. If budget permit a cam change is also in the plan.

The engine is a 1972 318, all stock (the compression checked good), Holley 1850, performer intake , headers + dual 2.5" exhaust.

I have a complete 360 but don't have the thousands of dollars needed for a complete rebuild. But for some stock heads and a cam that I could afford, if worthed.