Duramax88

Hey. I have a 2007 shee. I wanna install a hotrods 4mm long or short rod crank. i have ported 67.50mm cylinders on it now. Im wondering which crank i shud go with, Also wondering if i can just run shorter pistons and no base plate. Also if i can just leave the port job i have now. i know it will be off but will it work for time being. Thanks. Any help will be greatly appreciated. Thank jeremy