You will have a lot of trouble finding one, I'm afraid. Edit: actually, maybe not http://www.sciperformance.co.uk/onlineshopproducts_53353_24171.html I don't know whether that is a good one, but the price seems OK.
go for a weber conversion, simple and effective! pierberg is rubbish!! lol had auto choke probs with mine, and in the end gave up and got the weber.. easy to do, and better performance too.
Yep, absolute no-brainer. Inlet manifold gasket and o-ring to fix what he's got - 10? Manual choke conversion for 'cheat fix' 58 Weber including adaptors etc, without fitting or setting up 250-odd