Excellent. Love the time-lapse video.
From this site:
http://www.35pickup.com/mulligan/weight.txt
It appears that the small block Chevy from the 60's and 70's weighs around 575 pounds, and your battery pack would only be about 445 pounds. So add in the motor, controller and racks, subtract the exhaust, gas tank (18 gallons of gas weigh about 110 pounds!), accessories and other ICE components, and you're probably talking only a couple hundred pounds over stock. That's going to be a killer car.