daveR32gtr, I live in Hobart and I just had the exact problem except that Bo. 5, 6 were leaking 90%. I just got it back after it was rebuilt with forged piston, rods all the good stuff plus they fully reconditioned my motor! It cost me 8k but that was everything including a big clutch and fuel pump. I got Griffiths Automotive to do it and I was very happy with them knowing that it was done properly and right the first time! I probably gained an extra 20-40% power on what I had! And I am very impressed with the car now.
if you got any questions then just PM me.
cheers