Pinion angle help.

It's a 70 Duster that had a 318 with 904 trans and 7 1/4 rear. I dropped in a Blt. 360 and a 8 3/4 rear. It still has 904 tranny. Just stock leaf spring car. no traction bars ,yet. When I just took angle off tailshaft it was 1 degree down. and I set the rear end at 3 down.