Big Blocks and Handling

I dropped a 440 4 speed in my 67 Fastback. It has eddie heads, aluminum intake , aluminum rockers, aluminum pullys, aluminum water pump and housing, fiberglass hood, tti under chassis headers 2" , and a lakewood bell with a 833 attached to it. I also added disc brakes and lite weight convo pro wheels. My question is how much heaver do you think this combo is compared to the 273 automatic that the car came with?
Thanks for the help guys.