Cost of unleaded conversion?!

[Elliot2000]

How much should I expect to pay to convert a 1600 lotus twin cam cylinder head to run on unleaded?
I spoke to a renowned engineering firm and he quoted £960 at least, this sounds loads! He did say the lotus head is a less straight forward job than most with the shimming and something else.

[Elliot2000]

That's just for the work on the head that I will have stripped off the engine myself. I think I will have a look around