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 Hesketh.  If I might just add to what Geoff has said about cracked blocks.  You might find someone who thinks their engine is good only for spares but I have had impressive results with cast iron stitching.  I went to Stitchweld in Burton On Trent with a 1926 Dodge Brothers side valve block.  They not only stitched up the water jacket (easy) but also managed to stitch across a cracked valve seat and machined it back to as good as new.
 The cost was very reasonable and the repair was a long term success.
 
 If you are pushed for cash you could always repair a simple frost crack with Belzona.  It's amazing stuff!
 
 Don't forget, however, that where ever you can see a crack  in cast iron there WILL be another crack or two probably hidden and running above and below (parallel) to it .
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