Hello Rick,
Putting some serious hours into your 81

Nice to hear you're beginning to like it as it is. As for the front speakergrills, you have to gently bend the grill in the middle (to flip it up so to say). The grill has some minor extensions on the left and right side so it "hooks" into the dash. You just need to bend it a little so on one side the grill pops out of the dash. Do this gentle, when you do this a xx number of time with disregard to the dash, the dash will turn upward where the extension of the grill will pop out. I hope i make any sense. Just try it its very easy
Groeten Peter.