I am going to put some heads on my 77 mustang II. I have done all the research on 351w heads and know good casting numbers D0oE-C or g and know the specs on them.

I know that they would probably give me some hp's but I also have read they are very hard to find. I do not know much about the 289 heads. I herd they are easier to find and have good compression. Thats about all I know

I am looking to do a budget build so I will be looking for used heads from a wrecker or at a swap meet.

Found a local wrecker that has a whole pile of them already off the cars/trucks haven't been there since I have got the casting numbers. He says he is selling them all for $60 a head.

So the question I want to know is. What would be the biggest bang for my buck 351 or 289 heads. And will my hedders and intake bolt up with them.?

The upgrades I have in my car are.
Cam, Im not too sure the specs' on it. I was told by a ford guy that it was the biggest I could go with out haveing problems running.

670 street avenger, 289 preformer intake. Long tube hedders. And some other small stuff that doesnt really matter.