If the hp ends up peaking closer to your 5800 as opposed to 6000-6300....... then I’d expect the hp number to be lower than what I predicted.

I’d be pretty surprised if it couldn’t make 650ft/lbs........ how far up the power curve it can hang on to it with the small cam is the question mark for me.
Like I said...... I nudged the peak rpm up a bit because of the porting.