@RJ
Please try https://www.classiccarclubsg.com/about
Either contact direct or have your car club secretary (that is what they are for, and most have access to the international network) contact and arrange an introduction and contacts of the marques in which you are interested. Take it from there.
I suspect you have not been to this little island previously, so maybe the following will help.
Changi airport is the best in the world. Even better if in biz or the real first class. Dubai and Doha are close second.
Has a Mass Rapid Transport system that is spotlessly clean. easy to use, an English menu and with vertical malls above most stations. Just leave your wife, girlfriend and daughters, and credit card, there and enjoy the city in peace.
Taxis are everywhere. I have made mates with one who collects us. The city CBD is a short ride, about 20 mins/ 20kms. The Raffles is my preferred choice of accommodation.
Central Singapore’s Clarke Quay has a plethora of food establishments. A good place if a little nervous about street vendors. Sentosa is the place if resorts are your world. Gardens by the Bay lights up at night. Top of Marina Bay Sands gives the best views. Especially in the early evening.
Singapore Cricket Club is the best starting point for sports. Try https://scc.org.sg/.
As mentioned above get the secretary of one of your clubs to arrange an introduction. You will need one. My go to place. Just a short stroll from the Supreme Court of Singapore for lunch and dinner.
If golf is your game, use your local club secretary to prepare an introduction.
No need to hire a car, use taxis. Car ownership is expensive and for the professional workforce. It is a small island. My mates eagerly lend me their well-preserved cars and I find driving, outside of peak times, easy and convenient. If you decide to hire, make sure you have an up-to-date IDP. So says the Police Commissioner of Singapore. Ignore the protests of the anti IDP lobby, and other backwoods southern lawyers, this is my stamping ground.
Weather. When not working, shorts, T shirts and thongs (flip flops to you). Magnificent afternoon tropical thunderstorms. I am enjoying it now. https://www.lonelyplanet.com/articles/best-time-to-visit-singapore.
Get your cash currency before engaging in commerce. If your try to use USD, you will be well and truly screwed over, but will not know it.
Have never tipped in Singapore. I consider it elitist and condescending.
Zero tolerance of narcotics. Death penalty is enforced. Similar story in other southern Asian countries. Do not try it. To the best of knowledge there are no Singaporean arms dealers in US jails to trade for you, and I suspect you are not a well-known athlete.
Brunei. Small country. Wealthy. Was there as a working guest not a tourist. SGD is accepted as equal to local currency. My impressions, a place for the wealthy.
Regards Ron