i am reassembling the engine after having the head reconditioned. i have put the timing chain back on but im not sure if it exactly on the right sprocket. i have tried to get the block to tdc by lining up the grove on the crank shaft so that it points up. i have done the same thing to the cam. i have heard that if the timing is off the valves can be damaged. im wondering if it matters having the chain a few teeth off perfect and if there is a way to make sure that it is perfect rather than just estimating?

You do want to get this right the first time....

Here's a short 'how-to' by one of our members http://www.classiczcars.com/forums/showthread.php?t=35670&highlight=timing+chain

Also, the search function will give you lots of returns on this issue. You will find the time invested is well spent. Keep us up to date with your progress.