I'm about to build my block (sleeves, piston, rods). I will start it next week. I want to get a bigger t/b and a local guy is selling a brand new JG edelbrock 65mm t/b for $240. The stock one is 60mm, is that 5mm worth the $240 or should i buy something bigger? I'm planning on making 380-400 whp. My set-up is in my sig. Thanks