Well it's been a busy past couple of weeks.
I decided to bypass the heater core to eliminate the possibility of slip heater hoses, I followed some advice on setting up how the coolent lines run from a local bloke who races a RB25. We have since found out that the coolent flows differently between a 25 and a 20, cause I over heated the engine and poped a head gasket. Luckily the head was still within the factory tolerances, so I only needed to replace the head gasket.
We got a good test day in on Saterday with 70 or so laps of Baskerville, the car is consistently lapping about 0.7 secs quicker a lap then last year.