Well for one a different oil pan. You'll need a dual sump. Headers will be different. Most of the 429-460 conversions I've seen went pretty smooth. You may want to get the conversion plate so you can mount a C-4 behind it. The C-4 will definitely outlast and out perform the much heavier C-6. One of the conversions I plan on doing in the future is stroking a 460 to a 514 and going for broke.
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