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Head selection

The heads on my car are the 4V, open chamber variety. That provides my engine with a low compression ratio via the use of the stock flat top pistons. I assume this change was made in late 1972 to respond to the smog laws. I understand I can get stock 4V closed chamber heads which will increase my compression ratio and hence power. Questions.
1. Other than additional power, what do I gain in changing to the closed chamber heads?
2. If I changed to the closed chamber heads, would this influence the selection of the Ford Motorsports cam (M-6250-A331)that I was planning to install?
3. What's the conventional wisdom here? Is this a change I should make?

Joel
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