I don't know what the car weighs, but i think you can get by with a cast steel crank, i would however change out the rods to "H" beams, i think they are a little stronger. On the pistons if you're going spray it i would definately go to forged pistons. Probe make a 2618 piston that can be bought for around $400.00, flattops will get you close to 11.00 to 1 with the small chambers. Can you get into the 11's with this combo??, i think so if the car weighs under 3500lbs without nitrous with an 850 carb and a torquer or airgap manifold. You may need more stall in the converter, maybe 3500.
JMO
Zip.