[Synchro909]

Originally Posted by Pete

Here is a simple way to get an indicator reading with a very pitted surface.
First, there must be enough flat surface left to do this. After simple cleaning with a file, make up a shoe for your indicator. Take a ordinary high tool speed tool bit, say a 3/8 square by 3 inches long and braze a pin to the middle of the tool bit that will fit in the indicator receiver hole. Now check the pin for 90 degrees to the bottom surface of the bit using another indicator. Close is good enough. Grind the corners off the bottom of the tool bit so it will slide easily over the surface being checked.
Now try checking your housing surface.

Easier still is to fill the low spots on the F/W cover with ordinary body filler or an epoxy putty, then file or sand down till the high spots show through - just like preparing a body panel for paint.