I don't know if you need to replace the 100mm for the 76mm, as the Type 051B kept its. The Type 363 radar can be changed to the Type 382 Sea Eagle, but I am not completely sure how much you can gain from that. The Type 382 is not necessary for the operation of the HQ-16. The radar near the funnel is the Type 364, and this remains the same on the upgraded vessel. Assuming you change the Type 363 to the Type 382 on top of the mast, this does not amount to a structural change on the ship. But in my opinion, updating the back end of the Type 363 would suffice. The Type 051B changed to the Type 382 for its main radar, but then the Type 360S itself on the 051B is an old radar even compared to the Type 363 which appears to be its replacement. If the Type 382 outperforms the Type 363 to a significant margin, maybe that is a good consideration for changing but I don't have the numbers. The Type 344 fire control radar for the guns remains.
I take it back. Type 382 probably has more than double the detection range of the Type 363 (250km? vs. 110km) and much higher peak power (100kw vs. 60kw). That must make it a required upgrade.