In regards to the coil pack, the silvertop one will physically fit on there and it will run
I did this when I fitted a s1 Rallye head, to my silvertop vtr.
But the car had a slight missfire, the car had diagnostics (good expensive kit, not a code reader) on several times and nothing came up, all live date was fine.
Changed plus still no different
Switched to leads and old type coilpack and problem went
So on that bases I'd say chances are your current coil pack won't run properly. This is just what I found on my car.
I do have a coilpack spare, along with the plug needed that fits. But with the plug I cut the wires back as I could, so it actually has the original 90bhp silvertop ones on there which should make re wiring a bit easier, cause when I did it we tried using numbers on the plugs etc etc but nothing matched lol so just did trial and error in the end then when finished and got the right combination I just deleted all the fault codes.
If you fancy the coil and plug let me know, I also have a set of magnecor 8.5mm ht leads, coil and leads have covered about 6k I'd say and were bought new. 65posted for the lot if you fancy it. Drop me pm if your interested.