Long forks-how much oil?

[2rabbits]

Just building my first chop (its a half-built project I've taken over). Its basically a '79 GS750 in a hardtail with extended forks. How do I know how much oil to put in the forks - do I put in the standard amount for a GS or will I need to put in more?
Thanks.
2R.

[dracken1]

you put in the same amount as standard, as although they are extended they do not have anymore travel :)