I decided to build my 47 FL without the S&S Stroker stuff.
I have 4 3/4 stroke flywheels, Pan Cylinders with 60 over S&S pistons, stroker plates, Knuckle 450 lift Cam and cut timing gear. This was all in a 47 FL motor but will fit Pan up to 54 (except the cam). I bought the motor in 1991 so the S&S stuff is a least that old but seems like it was not run.
This "Kit" gives you a 92 inch Stroker Knuckle. See a more detailed description in a post I did on 2/5/11 when I thought I was going to use the stuff.
If you're interested shoot me an email.