Paul,
I secomd that. There's is second to none. A matched set as you will. When I ordered mine they sent the standard 351 flyweel. When notified that mine was internally balanced, it was swaped out at no cost to me, and no questions asked. Very good people to deal with.
From my experience, a phone call is the only sure way to make contact. E-mails tend to get lost in the shuffle sometimes! But, they do make lovely pieces and are well worth the effort to acquire.
Thanks to all for the info I will contact them on Monday.
It'll be nice to mate the 930 to the SBF, I can then confirm final dimensions for the gearbox mounts & (finally) complete the chassis design. Albeit the 'bit that hangs out the back'!!