water injection questions

[FCCOOL]

I am looking for a water injection kit for my car I am rebuilding, It has I holden 179 with a cr of around 8:1, stroked to 208, ported and cc'd head, yt rockers, acl race series dished pistons and a custom camtech cam in a 1200kg 1959 holden.
It has a small sc14 supercharger I will run at about 9psi with 2x2" SU carbs.
I wanted to add water injection but dont want to spend over AU$350
I have read alot of different views, it seems there are 5 kinds-
-Vacuum operated (no pump)
-variable with a fairly low psi pump like the ones from edelbrock and holley.
-boost activated, on/off high psi (like cooling mist)
- the dearer variable high psi like aquamist.
And last the direct port multiple ijector expensive fancy ones.

Here is some stuff I have heard-
1. water should be variably injected at a ratio of 20 water and 80 fuel and atomizing is not important.

2. water should be atomized at above 60 psi to make a safe and effective mist wich will not work well if the pump slows when controlled by a variable control module

What is crap, does anyone have any dyno comparisions or theorys?

Should I inject the water into the inlet side of the supercharger or at the manifold?

What would be a good low cost kit for the above car that will be driven to work, on trips and raced at the drags.

do you need a different size jet to run straight water than if you are running a methanol mix?

Any useful advice would be appreciated,
Cheers