What's the weight of a Small Block Chevy and Big Block Chevy?

[Glock 18]

Can somebody please tell me the exact weight of a factory 350 with cast iron heads and intake? It's the original engine that's still in my '69 Malibu. Now what is the weight of a 454 with Aluminum heads and Aluminum intake? I'm need to know how much the car will drop when I install the Big Block with aluminum heads and aluminum intake. Any help is appreciated.

[DynoDon]

EXACT weights are tough due to options etc. but figure 575 for your iron mainfold SBC and 650 for a BBC with aluminum heads or 550 for an aluminum block ZL1

[Lowend]

great resource
http://brian-callahan.com/Brians%20stuff/camaro_database.htm