sunk valves, stem height problem

Thanks for the help guys, i have to say all the valves are new and there isnt more than 0.003 difference in their height... I called elgin industries again, the tech guy didnt have any information about installed height or grinding the tips, i gess he has the same information i have (the online catalog) whatever the oem says he said...lame.

Grinding 0.030 off the tips without a book/manual/specification allowing me to do it is taking a big risk if i grind down the hardened surface the engine will die in no time.

I wish i could install adjustable pushrods or adjustable anything but i can barely get stock parts here and waiting a month for an aftermarket part to get here is just impossible right now so ill have to spend more money to get new valve seat inserts installed or get the heads detroyed in the process