While you are at it, get the head pressure tested, and hardness checked. Ive had heads crack, and lose their hardness.

I have the service manual at home, it tells how to check if the head is warped or not. If it is not, ill just chuck it back on with a new gasket and see how i go.

If its no good, should i get a head from the wreckers?

Also how do i install a distributor correctly?

remove number 1 spark plug, crank engine over with your finger covering the plug hole untill pressure is felt, then as soon as you feel pressure STOP cranking and look where the TDC line is on the crank pulley, it should be close to the TDC mark on the timing case.

Line up the mark on the crank pulley againt the 8deg mark on the timing case.

You now have the point where number one cylinder if ready to fire

now place the distributer cap on the distributer and with a black texter mark down a line down the side of the housing where number one lead goes on.
Remove the cap and place the distrubiter in the block so as the rotor button lines up with the black texta mark on the housing.

the fireing order is 1-3-4-2

Tip-
with the distributer installed the rotor button will turn a little bit one was but not the other, this is the Centrifugal Advance
, the direction it truns a little bit is also the direction of rotation of the distrubiter

Thanks for all the info guys, much appreciated. Will let you all know how i go...