Sure I`ll build it, but your gonna pay me afterwards! ha.
You want 400 horsepower and lots of torque then the writings on the wall, get more cubic inches. While 327`s are outstanding engines, they have a shorter stroke and stroke is where torque is at. I`d suggest a 350, or even better, a 383 if you really want a torque monster. However, 400 horses from a 350 is easy as well. Your stock heads aren`t going to cut it, don`t waste your money on them. I`d suggest a set of vortecs or better, and a better intake also. Cam it accordingly matched with the compression ratio and carb size with a set of headers and your there. We need to know what the rear gear ratio is as gears play a big role in this. your goal of 400 horses and lots of torque is simple with a 383, and it`ll be a blast to drive and won`t break the bank.