422 dyno fail

I'm just jumping in here but, my 1968 318/390 stroker is 30 over. I think cam is 287/525, edlebrock heads out of the box, edlebrock performer intake, 750 quickfuel manual secondary,double pump, no choke. It made 450H.P. and 490 TQ.
Sorry, it's first coffee, I'm just thinking numbers are low with what you have. I hope you get it figured out.