Hey guys and gals,

as you all know I have sold off all my A series racing bits and I have decided to go down the SR20 route to race in Improved Production Under 2 Litre in NSW next year.
Now my dilemma is with all the searching on the web and on this site I cannot see a clear way of doing this.
Fitting the engine and box is the easy part but the thing I want to know is what SR20..there are so many variants.
Rule out turbos as that will put me into a higher and tougher class of racing.

There are s13, S14 and S15 variants all coming in SR20 DE , SR20 DE with variable timing on inlet cam and SR20 VE which variable timing on both cams.

Now the question is what engine / gearbox combination would be best for the 1200 to deliver max power for under $5k with 160-170rwhp and significant torque increase whilst remaining very reliable.
I need to know if possible the different scenarios like:-

A) use the SR20DE form a silvia S13 , use aftermarket quad throttle bodies, programmable ECU and port heads and use race cams (dont know what type). R32 skyline gearbox...

Any ideas guys??