When putting new cylinder head howmany valves need to be open?

Assuming that the timing chain is in the correct position, and you do not have compression in any of the cylinders, you will need to check if any of the valved are bent by taking off the rockers and inserting air into the spark plug holes and see where the air goes. Either through the intake or the exhaust. If the air is escaping, then the pistons probably have hit the valves while they were open.

it not possible,the only where you can get reach to valve seals is by getting ride of valve clips.

it will definitely affect the selling price, a valve job on a 3 liter engine is not cheap.

Engine oil going to radiator is a cylinder head problem.
Either
1. Cylinder head gasket burnt
2. Cylinder head bolts not tight enough
3. Cylinder head cracked
4 Cylinder head warped.

Remove cyliner head and pressure test it for cracks. If cracked replace unless someone near you can repair effectively. If not then skim and you might as well do a complete cylinder head service ie valves, stem seals etc. Put back head with new gasket and torque correctly and be surprised with the results.

All of the valves in the number one cylinders should be closed when the engine marks line up at TDC (top dead center). BTDC= before top dead center, ATDC = after top dead center.

What that means are new valve seats and valve guide, with new valve stem,with new or refurbished valves,This is a common need after so many years in service

DON'T KNOW HOW MANY MILES BUT CRYSLER PRODUCT ARE KNOWN FOR BENDING THE VALVES
WHEN THE TIMING BELT BREAKS, YOU WON'T KNOW HOW BAD THE DAMAGE IS UNTILL YOU PULL THE HEADS. NEW VALVES AND CHECKING THE HEAD COULD RUN UP AROUND 800 DOLLARS WITH OUT REPLACING THE HEAD. A NEW HEAD COMPLETE 1,700 DOLLARS THESE ARE JUST ESTIMENTS NOT A GOOD SIGN, I'LL LET YOU MAKE THE CALL 2,000 REPAIR VERSES 20,00 NEW CAR

Yes, you need a Rocker cover (valve cover) Gasket kit. Remove the valve cover, remove all old O-rings and cover gasket, clean grooves and mating surfaces without gouging or scratching them, put the new gaskets on as per factory recommendations, tighten to the proper torque and you're done. The spark plug holes in the cover are part of the valve cover gasket kit. Any Napa, Car Quest, Pep Boys, Auto Zone will have it.

If your valve timming is correct the valve should not contact the piston, and upon fitting the camshaft some valves are bound to get openned. That should not worry you, before you crank start it or after installing the T-Belt and adjusting it, rotate the engine manually 360 degrees to make sure tht it does turn all the way and you can also check if the timming is right by following the valves openning and shutting at different stroke on the cylinders..the firing order should 1-3-4-2.
Hope this helps!

You need to replace the valve seals with new ones when you do the valves.... also... did you check the fit of the valves as the valve guides may have been damaged as well