Stall on a Stock 904 Converter?

Incase useful, following message above - here’s the main build specs…..

• 5.9 block Magnum 360 block from a 2001 Dodge Dakota
o Bore and Stroke: 4.030 in. and 3.580 in.
• Stock OE crankshaft externally balanced
• Stock Rods with ARP Bolts
• Speed-Pro Hypereutectic Pistons
o H11CP bored .030 over
o Compression ratio: TBD
• COMP Cams Custom Grind Camshaft
o Hydraulic Roller Tappet
o Duration: 275/279
o Lift .533/.536
• Morel 5321 Hydraulic Roller Lifters
• Liberty Performance pushrods - 6.8” by 0.080” wall
• Scorpion Racing SCP3302 Rocker Arms
o 1.6 Small Block Chrysler
o 5/16 Adjustable Pedestal Endurance Rocker
• PIE SuperTune EngineQuest Magnum Cylinder Heads - level-1 porting.
o 2.02" stainless intake and 1.625" stainless exhaust valves
o valve spring 125# seat 315# open @ .575 lift max
o 8mm valve stems
o 172 cc intake runners and 72 cc exhaust runner
o 62cc combustion chamber
• Edelbrock Pro-Flo 4 EFI including intake