5.9 Magnum opportunity

You would reuse your 318 904 converter as it should be neutral balanced. The 1994 5.9 engines used a neutral balance flexplate and weighted converter. So, you will need a 5.9 flexplate with the weight, typically found on 1996-ish and up 5.9 magnums. I got a new one from the parts store for less than $50. You will need to cut a hole in the bellhousing for the crank sensor if your keeping the EFI. Your headers will work fine. You will need A 360 driver side engine mount or modify your 318 mount. The van will have the correct power steering pump for an A body swap. It fits perfect without having to modify the battery tray like required with a truck pump. A stock 1970 dart steering hose fits without modification. I use a cheap summit fuel pump on mine with a cheap regulator and no return line on a street demon carb setup. If you want to keep the EFI you will need a high pressure pump. I've used an MSD external pump and a corvette regulator/filter to fuel an EFI magnum. Worked great for thousands of miles and is a pretty cheap EFI fuel supply.