Thanks for the replies guys
I e-mailed Martin at Chisel Speed after your post Sean and have now got a great selection of costed options including different con-rod lengths to choose from.
I need to do some research now into the pros and cons of engines fitted with 107/110/115 length rods :bouncing:
And then there's the "which top end" question
It started out as "I'll just clean up that spare engine over the winter...." to quite an interesting project!
Cheers,
Nigel