Hi, im afraid i can only give you bad news im afraid, if the engine was running even on tick over when the belt snapped then this would have caused the valves to smash into the pistons as the top half of engine would have stopped spinning leaving at least 2 valves in the out position but what causes the damage is the bottom half of the engine, as their is no weight on the cams to keep them turning they stop at once but the bottom half the crank has a big weight called the fly wheel now when the belt snapped the cams would have stopped dead but the crank would have carried on turning under its own weight and this is what causes the piston or pistons to hit the valves this then causes the valves to bend and all the valves will need replacing and the whole top end rebuilding with new seals and the new valves and valve seats will need grinding in.
how ever as its only usually the top half that gets damaged you could save yourself some time and money by calling a local breakers yard and see if they have a cylinder head lying around or even a whole engine as the cost of rebuilding you head and engine would cost more than it would to get a second hand cylinder head or if you didnt want to take any chances look into getting a whole engine.
look at the costs involved get a quote off you garage for the head rebuilt and new valves, tell them worse case if it needed complete head rebuild with all new valves and valve seats and all the seals get a price on the whole job then ask them how much it would cost if you supplied a working cylinder head or even whole engine then compare the prices and check with some breakers for cylinder head prices or engine and you should find that a second hand head will work out cheaper than having yours stripped and rebuilt with new parts.
let me know how you get on or if you need further assistance ok
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