When doing any alloy block/head builds I set initial cold lash at 0.015" then run motor up to full temp & recheck when hot. Now your cam card suggests 0.020" hot so say the hot lash checked out at 0.022" then we would know to set the cold lash @ 0.013" to arrive at a hot check of 0.020". Virtually every combo & application is different, so doing it like this and keep it that way for 'your car' makes it simple.
