Need advice racing a 380 horse crate engine

I would open the exhaust up and see what happens

Another comparison for you

I have a 67 Valiant. 360 with stock bottom and 484 cam(I’m told). The rest I know. Aero 2.02 heads, RPM Eddy, 600cfm Eddy carb, TTI headers and HEI coversion.

Stock converter, manual valve body, 4:56 gears and DOT 26” slicks

1/8 mile 8:80 @ 79 mph through the 2 1/4” headpipes, thrush welded and full 2 1/2 tailpipes.

8:65 with the headers open