Ok, bit of history on the car;

2wd saph, I've owned the car for 9 years and for the last 4 years (before I took it off the road) it has been running in the region of 350 - 380bhp. original 205block & 2wd head, internals are standard, wire rung block, escort head gasket.

some of the bolt on upgrades;

grey injectors
GT30 (just replaced T34)
water injection
4x4 intercooler
oil cooler
nms live mapped chip

Car is used hard and on track (Leda & AP upgrades), I have done 35,000 miles on this kind of spec, engine has done 96k so I think I've done pretty well with this one! It is looked after with oil changes before/after each track day etc

The car has been in the garage for the last 3 years, in the past couple of weeks I have got her back on the road, I changed all fluids including;

brake
engine oil
gearbox
diff
coolant

put new brake pads on, drained the tank, new fuel filter etc etc.

The car seemed to be going OK (was holding approx 30psi on T34 but knocked it back to 25 with new turbo until get it setup). Nice weather today so thought I would carry on getting her ready for the season and was going to get it on the pit to clean & wax oil underneath. Checked water etc before setting off and noticed the level in the header was a little low so topped it up (had my suspicions already) got to my parents where the pit is and popped the bonnet, cooling system was quite presurised and noticed it looked a bit leaky around the front right corner of block/head so defo head gasket needs doing. The engine is a little noisy now and I think it's time for a re build, I've also noticed since its been back out that there is quite alot of piston slap on start up(i know you should expect some on the 2wd) oil pressure on tick over when warm is 35psi. Also when you stop at junction it was puffing bluey smoke and was firing on 3 when idiling for a short while. So while the heads off I'm going to have a good look, what should I be expecting to find....
& what would be best course of action so I can have a reliable 400-420bhp??

Cheers

Jodi