Looking for a little help selecting a new cam.

Heres what I've got.

62 Dart
426 max wedge 12.5:1 comp
Stage 3 heads and stock crossram/3705 carbs
3600lb car, with an auto (J converter) and 4.30 gears.

Right now the car has a MP .533 hydraulic P4529318. From what I gather, its not very well liked...

This setup ran 12.00's at sea level, but up here at 6000ft elevation, I'd like to see if I can squeeze a little more out of the car.

Leaning towards a solid cam this time, but am open to suggestions.