the plastic part of the dash is cracked on my '98 z28...fixes i should know bout?

No fix really.. Normally people just buy a new/used one, or go with a carpet dash pad. Either can be found on ebay.

Dash cap... Had one and didn't like it though. New dash is expensive ~$300-400 depending on year, etc.

Caps are about $100 but don't fit all that great, if you're a details oriented person you can see them a mile away, but otherwise they look alright.