After a lengthy drive, when I park my '55 TBIrd in my garage it always smells like gas.  This worries my wife because she thinks it will explode.  I've checked the car front to back numerous times and it's not leaking anywhere.  The engine is a rebuilt stock '55 292 with all '57 top end and distributor.  The carb is a new Holley 1848-1 465 cfm on a '57 iron intake.  The idle screws are set 1 1/2 turns out.  The air cleaner is an after market item.  I thought the engine may be running rich so I adjusted the idle screws in and it didn't idle well, so I put them back to 1 1/2 turns and it runs great.  Is this normal for a Y Block?