If you go with just 306 roller you need no changes. Don't know what a 357 is...you mean 351 ? Also if you buy a crate motor (long block) it comes wth water pump, dampner, distributor, intake...all you should need will be plug wires, carb, and headers.
Ron
[This message has been edited by Ron1 (edited 11-09-2001).]
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