Oh goodie, a nice historical question.
Firstly, there is no such animal as a 1E 196 Super Sport engine. You have a bitza. DO NOT WORRY. This is a GOOD THING. You have a combination of the best parts of both which was the standard answer to making a reliable 196cc Super Sport. These engines share many parts as you will find out.
The 1E was the workhorse having a cast iron piston with fixed head and barrel. The Super Sport had an alloy piston of identical dimensions plus a removable alloy head with shaped combustion chamber. Altogether a much livelier and perkier engine with much reduced vibration.
The bottom of the range 1E used petroil lubrication, there was also a Villiers Auto lube version. The Super Sport came in Auto Lube only. Petroil is owner tolerant, the Auto Lube system is not. It demands a certain amount of skill and knowledge from the owner for long term reliability, From the survival rate of Villiers engines with operating Autolube systems you can see that sort of owner was uncommon. The answer was a Super Sport top half built up on a 1E petroil lubricated bottom half. This is what you have. It is a good combination.
Your conrod is the standard part for the 1E, 2E and both the 172cc and 196cc Super Sport engines. Alpha Bearings will have an off the shelf big end for you. From memory the later 6E conrod is interchangeable but I wouldn't trust my memory without measuring first.
The crankshaft has a straight 1-10 taper. No key is fitted. Standard removal procedures are all that is needed. Put a protective nut on the crankshaft thread first. Good crankshaft halves with good threads are hard to find.
Do you have a complete engine? This includes the flywheel magneto plus inlet manifold and Villiers own carburettor. The standard factory set up gives lovely results with little effort.
Finally, how many teeth on the engine sprocket? Villiers provided a range of sprockets from 14-24 teeth. What is fitted to yours?
Looking forward to an interesting answer.