Stefan;
I suggest you look for a copy of George Reid's book "How to Build Big-inch Ford Small Blocks". I got my copy on Amazon.com. The 351/427 stroker kit is available from a number of sources (Coast High Performance springs to mind first) but it makes some builders nervous because the wrist pin sits so far up into the
oil ring groove. If I were you I think I'd spring for a crate motor with a good warranty if you want a 427W since you're so far away from the suppliers. Just my $0.02.
Bill Stradtner