You are correct, it did not have a Holley originally, it had a Carter 4711S. The 98 code is the last 2 numbers of the original Chrysler carb part number. The attached parts book page gives the Chrysler and Carter part number (click on "attachment" for full size view). I have an Edelbrock 650 on my stock 69 440 and like it. Perhaps others will give opinions for a 383.
I don't have info on the 897 engine code but the H in the vin is the 383 high performance.