318& 360 la

Yeah don’t care about price that much . Want it to work and be drop in . I don’t want to rewire all this . Each of those summit kits says stuff needs re worked and retrofitted .
Agree that's BS and locks you into their system.
Drop in good one for a stock ish 360 & 318 , both have headers and intake and 4bbls . But not cam or anything like that
73 318 challenger . and 74 360 dart
So here's the deal. If its truly stock, then you want the exact part number in the Service and Part manuals. They will have specific distributor curves to work with that specific engine's set up. Then you set initial timing and fuel mix to factory specs and that's it.

However, someone who put headers and aftermarket four barrels on has already somewhat altered/defeated the emissions setup. Also a four barrel will allow combustion efficiency to increase in the higher rpm ranges (roughly 2800 rpm up); therefore will not need or want the timing to continue advancingin that rpm range as quickly as a two barrel.

Your best bet off the shelf may be the Chrysler built Mopar Performance/Direct Connection distributors. Sometimes these are available used but you won't know if they've been mucked with. You can ask Halifaxhop what he has, and/or look in the for sale section to see what he has listed. Howver he has more than is listed.

They have the orange mopar box in them but also have the resistor still .
Chrysler painted a number of boxes orange, but it may be a Mopar Performance ECU. If the part number is on it, that will be a clue.

Both the '73 and the '74 originally came with two resistors because the originally factory ECU used a 5 ohm resistor to help control the ECU's power supply. Later ECUs only need the 1/2 ohm resistor.