67 tbird exhaust problem

I have two cracked exhaust manifolds and I can't find replacements anywhere, so ive decided to put on headers and a new exhaust system instead. My budget is limited, and the only headers I can find for my 1967 Thunderbird 390 FE are hedman sport competition, which is out of my price range and not the header im looking for. I found these headers for a Mercury Cougar http://www.autopartswarehouse.com/details/QQMercuryQQCougarQQFlowtechQQHeadersQQ19671970QQF3 112102.html
and I was wondering if anyone knew if they would fit on my tbird.

Any other suggestions or ideas on what headers or exhaust manifolds I should look into are EXTREMELY WELCOME.

Thank You.

Try these places: http://www.car-part.com/cgi-bin/search.cgi or http://www.tbirdsanctuary.com/67-71parts.html

Thank You very much.