Tips For lowering 86 S-10 Blazer

I was wanting to lower my blazer 4in in the rear by using a 4'' lowering block kit. I am planning on putting a 350 V-8 in. I need to know how far just puting a 350 V-8 in will drop the front(stock)? It has a 2.8 in it now. I want it to be flat, not have the front down or rear down when i have the 350 in. Next question is, should i use Drop Spindles in the front or Coil Spings? How many inches in the front?