ok so im building a 91 chevy 3500. 4 door long bed. im looking for 12 inch springs with no block at all in the back. so do i need 16 inch springs for the rear and 12 up front? ive heard mixed answers.

also, where can i find a good deal on springs and some xover steering.

last who knows of a goodplace for rear disk brake conversions? all the kits i found are expensive.

thanks guys,