I would at least run the engine with the carb to make sure the engine build was OK, then think about fuel injection. 1st rule, never ever throw Tiger engine parts away – you might want to go back to original or the next person might.
There are 2 bbl FI systems available and there are some systems that don’t require a full return line back to the tank but you need space for these parts. Your the owner, you have to determine what you want.
If you have never driven a Tiger with a stock engine, you need to do that before you modify.
There is very little you can do to a Tiger to lower its value other than wrecking it completely.