1.8->2.0 tuning???

whats up guys.
couple months ago i slamdunked a 2.0 16V into my 89 GTI 16v.
I retained the inj and ign from the 1.8.
I did no tuning during this swap just plugged in the injectors and dist and started her.
She runs good but i think theres some hidden power in her.
Heres the specs
2.0 16V
Kent cams 268 set
k&n filt
blue ignitor wires
f6dtc plugs.
what can i do to my timing and fuel etc. to maximize power?
also should i build/buy the enrichment module?( i think i know this answer)
thanks!!!!!!
-cat