Inliners International Forums General Discussion Engines Chevy 216 Target gauge

I've been tricked into working on a Chevy 216 engine.Everything I ever read says the adjustment of the oil shooter pipes for the con rods is very critical.The manuals show the use of the Chevrolet Target gauge to check the pipe alignment.
My question to those who have worked on these engines,where do I find one or are there deminsions available to make one? thanks