If you want to go port injection then your best bet would be a Holley HP ECU. 120 lb injectors are at least double what you'll need on that 543. You can control timing if you use a Holley dual sync distributor. I think a dual sync distributor would be less of a hassle than the 60-2 trigger wheel. There are also 36-1 wheels available for Mopar engines. I don't know anything about your throttle body, It might work but you would need to confirm that all of the sensors are compatible with the Holley ECU. It might be easier to buy a new Holley throttle body, they aren't super expensive and they are plug and play. Rich at FAST Man EFI is a Holley dealer and a Mopar EFI expert.