Sorry but again its asked: Spindles or Springs?

[one legged lance]

Ok I know that this has been hashed before but my wife wants me to check before the cash is spent
I am planning a complete front end rebuilt anyway so everything will come apart & I will add a frt sway bar also. I have a 72 C-10 w/ 350ci that I want to mildly lower. Only 3-4 in frt & 4-5 in rr. Ride quality is important as she would like something built for her in the future if mine turns out nice.
I have been told that since I want to run 15in truck rally's that spindles will rub or interfer.....true? Anyone done this and problems?
Rear I am thinking of a 4in coil & mabye 1in block...thoughts??
I have thought about bags all around but the cost seems high, what am I looking at? I think early classics has a spindle/spring kit for around $900 but I can do springs only for $200, how much for bags and what do they require?
Thanks for all the help even if you have given this info to 1000 b4
1 Leg Lance