Is there a trick to removing the two allen screws that hold the vacuum line and upper A/C hose to the top of the fuel filter mount. It looks like these two screws also hold the top of the fuel filter mount to the support from the block.

I've had the heads soaking in PB Blaster and tried them on a hot and cold engine. Should I start beating the upper mount or use a torch or what? I need to remove one of the allens but don't want to strip it.

Thanks,
Willson
85 300CD