LA 360 or Magnum 5.9

I just want to build something I can cruise that has a good lopey idle that will occasionally eat up a camaro and mustang here and there. I got my current 318 I could result or I got a chance to do a magnum but I'll be honest as I am limited on funds,

Id go with a running 5.9 magnum just add some headers and 4bbl and you hit your minimum of 320 hp add cam later and hit 350 hp plus.