A few A model questions

Hey everybody, new to the site. Recently picked up a 77 extended hood day cab with a big cam and 13 speed. My intentions are to build another transfer. It really doesn't need a whole lot other than a major cleaning and some tlc. I was wondering if anyone could point me in the right direction as far as getting the front end to sit a little lower as well as centering it in the fenderwell. I don't want it too low as its going to see some dirt job sites. I also wanted to run a 2 leaf progressive spring pack up front and was curious if there was a spring that swapped over. Any help is appreciated!

 

I'm not worried about the location, that's just something that's always bugged me about A models. I'd rather it be center than forward.