Cam timing

[e2e]

Hi listers
200tqa 1B motor
I've finally got the front off my motor to do the vastly overdue cam belt.
Special tools? What special tools! A piece of 50mm box section about 80mm
long with a big pipe wrench(stilsons) clamped on works 100% as a crank
locker! The cam belt looks so good I might just turn it over and re use it,
just joking!
I want to advance the cam by getting a couple of extra keyways cut  at say
1/3 and 2/3 of a tooth advance.
Readers poll: how many degrees (or % of a tooth) should I go for?
Will I need to re set the dizzy or is that amount of advance within the
bounds of the normal range of ECU adjustment?
The injector pipe cooling fan has been running constantly so I unplugged it.
Where is the sensor for it? Is it relayed as well?
Thanks in advance.
Miss you Phil

--
Sam Clarkson