440 Dart pinion angle?

I have a 8.8 cut and taking it to the welder Monday. I’ve read to properly get pinion angle I need everything installed for the 440 swap, set the car fully down on the tires with 8.8 under it, and measure output shaft then calculate the pinion angle and weld the perches on as pretty much the last step in the swap.

Is there a chart or anything that could give me a pinion angle now. I’d love to just get the perches welded on Monday and be done with it. I’ve seen a lot of threads saying 3-5* down.