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Re: 289 power???
400 horsepower is a stretch for the little Ford. Of course it can be done, but will you be able to actually DRIVE it when it's done? It will be quite "rowdy" (the cam and compression necessary for the power level).
I would consider a "stroker" kit to get there easier. The 331 (or 332, depending on who's catelog you read) is the hot ticket. It ends up as the same bore/stroke combination as a .030 over 327 (Chevy). Good revver. The 347 kits are popular, too, but the rod/stroke ratio isn't very good. This can lead to durability problems.
A solid roller camshaft and aftermarket intake/exhaust are also necessary. You'll need some serious rear gear to support it.
The 289 heads will also be "too small". Don't waste a bunch of time or money trying to get them upgraded. Modern aluminum heads, or World Products "Windsor Jr." heads will breath well enough for your purposes.
Hope this is helpful.
Jim
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