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Re: 1963 chevy truck 1/2 ton big block swap
You will have to trim the top flange of the frame back aprox 1/2" on both sides, the length of the engine. I usually use a '68-'87 frame as a reference. Then you can use headers made for '68-'87 trucks. But beware, they are long tubes and will hang down a little below the frame. What motor mounts did you use? If you used the originals for your truck, they may need to be clearanced for the headers.
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