Switch over to 460ford.com do a search on strokers.
There my friend you will find a huge wealth of information on strokers.
I would suggest contacting Paul Kane at
http://www.highflowdynamics.comor Lem Evans at
www.bfevansraceparts.com These are just two of the gentlemen I have delt with so far and can tell you this.
These are two fine people.
Dave