firewall bulkhead for wiring

what has everyone been doing for the thru firewall wiring when putting these hemis in ? is there even room to use the factory three plug bulkhead electrical connectors for the wipers and light harness? i was thinking of fabbing up something out of aluminum like they do for street rods , any comments or concerns , pics would be great , what would i do without this site , thanks to all . dartman 440 ed :D