Need help deciding suspension set up and Porterbuilt Dropmember

[bigo181979]

I am looking for some info on suspension for my 68 Chevy. I am currently in the planning, parts ordering, and teardown phase of my build. I see you porterbuilt offer 3 different front drop members. My goal is to go as low as possible on air, I would like to lay frame, however I would also like to keep a stock bed floor.

From what I have read that is not possible. So what is recommend to get me as low as possible front and rear while maintaining a stock rear bed floor? I would like a complete front kit including, brakes, spindles, steering rack and all. I am trying to build this on as tight of budget as possible and with everything I want to do I need to stretch my dollar as far as possible, so I ma loooking more for the necessity's.

As for the rear, what are my options to compliment the front? Can I modify the stock trailing arm setup and still get low or what do you guys suggest?