3rd time is the charm!!

[Born Lucky]

I had gone through 2 main seals , a sliver would always have off in my last 1", and I was determined that number 3 would be the LAST ONE.
I decided to remve all the caps and lift the crank slightly. Man did this work, the 3 MAIN SEAL slips right in.
DONE DONE DONE with the rear main.
I have a few questions with the timing cover and the rubber gasket below the cover.
I did not use a alignment tool to install the timing cover, Will this hurt my harmonic balancer? Also do I use RTV Black gasket sealer on the rubber gasket?
Thanks all