Electrical/charging issue HELP

No it will not start while in park, only in neutral. But it doesn’t do this every single time. It’ll only do this when it’s been running for a bit of time.

It’s got a 4.5L 273 V8 engine with an Edelbrock 4 barrel Carb. The battery is brand new. It has gotten the following parts replaced, (also got a partial rebuild of the engine done, but I don’t know the exact details of it because it was done under the previous owner):

Cardone Distributor

Resistor (ballast) block

Felpro intake Manifold gasket kit

Murray 195 degree Thermostat and thermostat housing gasket

Gates Upper radiator hose

Gates Lower radiator hose

Ultima Alternator

Voltage regulator

MasterPro V-Belt 1/2 Inch x 53-5/8 Inch - 9530

Alternator belt

Water pump hose

Heater hoses

Power torque (engine) Motor mounts (2)

Westar Transmission Mount

Water pump and gasket

Fuel tank, hose fittings, hoses, gaskets

R45xls ac delco spark plugs

Accel Super stock ignition coil

Accel super stock plug wire set

Fel-Pro coolant outlet gasket

Brake best wheel cylinders (front and back)

Brake best Drum brake shoes part 333 for front 10 inch and 329 for rear 9 inch

Ac delco drum brake shoe hold down

Drum brake hoses

Best brake drum hardware

Edelbrock carb mount

4-barrel edelbrock carb (added by previous owner)

Standard Ignition switch