[Rev]

200/283 are not bad at all for a relatively stock 5.0. On a chassis dyno, you want to use high gear either auto or standard, whatever is 1:1. that would be 3rd in the auto or 4th in a standard. Be sure your rear tires are aired up on the high side (I use 50 psi). That reduces rolling friction and helps the numbers slightly.

The Hp/torque figures will represent how your engine was set up. Good torque means better driveability generally with less top end power. The hp/torque curves are largely determined by what cam you're using (but the whole engine combo has to work with everything else).

The 200 rwhp means around 250 hp at the flywheel, not bad for almost stock 5.0

Rev