Small block upgrade advice please..

Hi all,
I'm currently building up the engine for my Li150 s3 resto.
I've acquired a GP150 case with GP200 gearbox and will be at 47/18 to keep the ratio similar.
What I would like is a little bit more power, just around town and the back lanes, so would appreciate your advice/recommendations for a cylinder kit and carb.
I would like to keep the setup as original as I can with regards to the carb through the airbox as it did originally.
So, a reliable cylinder kit and carb set up that uses the airbox is what I'm after. Just wanting a bit more power, just to keep up with traffic a little easier.
Budget wise, I believe you get what you pay for, within reason.
I realise there are similar questions posts with regards to this but I just wanted to make sure that anything recommended is suited to my set up. Apologies for that!
Any advice would be much appreciated.
Thanks in advance.
I'm currently building up the engine for my Li150 s3 resto.
I've acquired a GP150 case with GP200 gearbox and will be at 47/18 to keep the ratio similar.
What I would like is a little bit more power, just around town and the back lanes, so would appreciate your advice/recommendations for a cylinder kit and carb.
I would like to keep the setup as original as I can with regards to the carb through the airbox as it did originally.
So, a reliable cylinder kit and carb set up that uses the airbox is what I'm after. Just wanting a bit more power, just to keep up with traffic a little easier.
Budget wise, I believe you get what you pay for, within reason.
I realise there are similar questions posts with regards to this but I just wanted to make sure that anything recommended is suited to my set up. Apologies for that!
Any advice would be much appreciated.
Thanks in advance.