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wrote:

... working with very irregular cast iron shapes that might
not fit easily into a vise. ...

For highly irregular shapes, one of the very low melting point alloys
can be used. These alloys melt around 170F. So, you melt some in a
cask, sit the part in it, and let it harden. The cast can be held in a
vise, or clamped down. When you're done, melt the alloy off in hot
water. Google or eBay Search "Cerrobend". It's $15-$20 / lb, but
reusable. Here's some for $12/lb Buy It Now:
http://cgi.ebay.com/Low-Temp-Alloy-F...temZ7600068112

Bob