I was going to say you can run on the dyno all you want, might as well through that out the window as soon as you hit the track though.
And yeah, 403nm seems low to me. Like I said, these small blocks are notorious for putting up very close hp/tq numbers. Traditionally a 340 will put hp above torque, and a 360 will put torque above hp. It's just the design of the motor. 403nm = 297 ft/lb as someone else mentioned. If you're putting 367 RWHP down in a 360, i'd expect RWTQ to be in the area of at least 380lb/ft, if not closer to 400. Maybe you're overcammed a hair and it's hurting your torque. Where did HP peak? I'm gunna guess 6200. What convertor you running?