422 dyno fail

If it hasn’t been done yet, a timing sweep should be done before going much further.
They want what they want, but the best SBM I’ve tested made the most at 33*.
Don’t “assume” 36* is best.

Also, maybe some fresh gas.

Is there any A/F monitoring happening on this dyno?

Just as an observation...... not any criticism........
This is one of those situations I refer to as “start low/end low”.
The TQ output is way below where it should be, and drops off pretty fast...... and as a result the HP just never comes around.