Mounting my scatter shield to block first or to the transmission?

Once you get it indicated in, take it back off. Leave the block plate (ASSuming you have the block plate) and flywheel on.

Stick the engine/headers in and then put the can on.

Those Lakewood cans are HUGE and trying to get 10 pounds of **** in a 2 pound bag takes way longer than if you do it pieces.

Been doing it that way for 43 years, and counting.