Used to put engine together run her in nice and warm with just the inner part of a 2 piece timing cover and then get the highest compression readings from the various cam placements using the multiple keyway sprocket..
Advancing the "30-30" cam isn't a great idea in terms of detonation sensitivity. The reason a "30-30" will run on pump premium with 11:1 compression is the late-closing intake valve timing, which bleeds off some cylinder pressure and reduces the dynamic compression ratio. If you advance it, the intake valve will close earlier, which builds more cylinder pressure, increasing the DCR. Not a good idea for a street engine unless you want to blend avgas or race gas with pump premium all the time.