It runs pretty decent. I have not had it to the track since I put the Eddy magnum heads on it past winter - seat of the pants says there is more jam there than before. Last year it had ported 202/160 J type heads and ran a best of 11.66 at 113.5mph but seemed to run out of steam around the 1000' mark - so re the magnum heads, otherwise I'm quit pleased.
There is no such a thing as a 2800lb Valiant on the street, unless there has been a lot of gutting. my 68 Dart 2dr post which is as light an a-body as they come weighs in at 3100 with aluminum hds and intake, 727 and 8 3/4 w narrow aluminum front rims and 7 1/2 steel backs, aluminum fuel cell and 5 gals gas - so don't be too surprised when yours comes in at ±3200.
Send me a pm on your combo - and any queiries you might have.
