Carburetor CFM 360 5.9 Magnum Recommendation.
I also have a ‘00, 5.9 w/a EPM intake and use Hooker 1-3/4 super comp headers in my late B body. 2500 stall in a 727/3.55 gear.
The 5.9 is a stock long block like yours. The RPM intake has a Edelbrock 740 AFB that works great. I like it over the 600 AFB. The larger throttle bores offer a better response with no mileage down falls.
The distributor is a MP unit triggered by a chrome box. The air cleaner is a 340 trap door unit. Off of the 1-3/4 header, it’s a 2-1-2 exhaust to the bumper.
I’d fix the carb and run it.