What way should I go?

[burning bullet]

I want to start of by saying I'm new here and I have a 67' step side long bed. I recently bought the truck from a friend. I am doing a frame off resto but nothing crazy. I'm only 18 with a part time job. The ? I have is what type of suspension should i use? I want a 2-1/2 frt and 4in rear drop. I plan on having around 400 rwhp and doing a lot of racing street and strip, but I also want to take it to a few car shows. I want power disk brakes on the front and drum are ok in the rear. I also have a shortened rear end with willwood brakes and decent size axles. I don't know if I should use that or the stock rear end with 3.73 gears and posi. So I'm not going all out drag but I want to be able to hold my own.
Thanks,
Andy