Alright Ken, here it goes.........I am going to give you my recommendations in rates/parts first, and then explain why.
The Front End:
Either a MOOG 6041 or a Hyperco 650# with Landrum spring adjuster.
A 7/8 or 15/16" bar would be a good place to start. But with the top heavy nature of a big block, a 1" wouldnt be a bad choise, but I also wouldnt run anything bigger.
The question/answer lies in the overall ride height. When you get to a certain lowered height, you will need a specific spring rate to keep it off of the bump stops with an iron headed big block. The cool thing with the adjuster is, you can change the height whenever you want. I run a alloy headed small block with a 700ish # version of the MOOG 6041 and there are times I actually want more spring.....where I could get away with it because of having more sidewall with 16" wheels/tires.
No matter which you choose, I dont think you will go wrong. I would run a 6041 just because of the big block. BUT
the 650# would be more compliant to what you were looking for in a aggressive street suspension without being too hard with the 17" wheel/tires. A good compromise.....
The Rear End:
A modified FIA design with a rate between 250 and 260lbs when using the Hyperco 650# front coils; and between 290 and 300lbs with the MOOG 6041, at the -2" ride height you are suggesting.
No rear sway bar.
Hotchkis style suspensions dont need a sway bar if there is enough spring in the suspension, considering that you are wanting to lower the chassis.
If you desire to have a set built, I will draw the diagram for you to send/give to the spring builder. They will have the leaf thickness and the individual leaf lengths as well as spring clamp spacing diamentions. This will take a day or two, as I need to calculate the leaf pac to get it into the +/- 10lb of rate I have stated.
If you can give me a fender height measurement (on all four corners) to how high you want the ride height, it will also help me out with some of the rear spring configuration.
I am trying not to lean to far towards spring rates that may be more than you want to run or find comfortable. I have tried to take into consideration the bushing material and especially the wheel and tire combo.
The battery location, other stated parts, shocks and drivetrain gearing are on the money, in my opinion. I think the suspension will respond to what you have chosen set-up wise.
Let me know the height and when you may consider doing these and I'll get to the drawing part of it.......