Lou,
I have a 351W in my 69 and the exhaust manifolds are better than the 289 log style but I would go with the shorty headers. I am with you about leaks that's why I won't put the long style headers in mine. The shorty style are alot better and usually do not leak. There are quite a few makers of this style just watch out for hedman they tend to last just a few years.
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69 351W Sportsroof deluxe
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