Big block cam selection

[6600DURAMAX]

Alright, time to build a motor for the mud truck, last week was the end of the old motor.......... 6 quarts of 85w90 and she still only has around 10psi when revving

Here is what I have already

4 bolt 454 block .030 over
12.5 TRW pistons with GM Dimple Rods
GM STEEL Crank - Need to decide if the crank needs turned or just run an oversized thrust bearing. Torque convertor ballonned and push it forward a little I was told.
World Product Grumpy Steel Heads that have been ported
Victor Jr Intake

Need:
Carb - Debating on 1050 E-85 carb
Cam and lifters ???????

I already have talked to Doug Herbert about their cams and he recommends a solid roller? I was thinking along the lines of a Hydraulic Roller, never ran a solid cam before? What is your guys opinion ??

Truck weighs about 3 tons or so if you were wondering

thanks guys