5.9 build for a ....D100

Hey everyone. Long time lurker here, love the forum for the engine knowledge! I am in the planning stages for building a 94 5.9 Magnum for my 2WD 78 D100. I know it’s not an A body, but this forum has a great active small block community, so hoping I can get some advice.

the engine will be paired with a 518 lock up over drive (I will be buying a good converter to suit the combo) and 305 45R 18 tires (28.8”). Right now the 8 3/4 has 3.23, but likely switch that to 3.73 because of the tire height.

block will treated to machine shop dip, honed (bored if needed) and new cam bearings. Likely rework the rods with ARP bolts.
I have the good EQ heads ready to go, with 2.02 intake valves, and Hughes 1110 springs/retainers. Open to buying some nice roller rockers. Intake is a LA air gap, and I have a 670 street avenger carb.

Truck will be a street bruiser, that needs to be able to cruise at 70-75 mph at times. Looking to keep it pump gas friendly as I am in Canada and can’t get above 91 octane gas.

I am really lost as to what pistons and cam I should be looking at for my parts and application. I have been looking at grinds by Hughes and Howard’s, but I need help. Open to information and suggestions!

Trucks weights 3780 pounds with me and a half tank of gas for reference.

thanks everyone!