It is a good idea to have one. I keep a small can on my bench and put the funnel on top of it to drain and then blast clean with brake clean. Funnels are like tools, different types for different uses.
Just remember, putting stronger springs on the rear of that super light truck is going to make it ride like it has no springs.
If you can find a helper spring that only comes into play when the spring is compressed would be one way not to hurt the ride as much.
If the cars were two door, they would be more desirable but it always amazes me the lack of rust. I bet they would get a lot more interest if they would show more photos and details.
As a Cuban, you should be able to see the advantage of simplicity and the ability in keeping a car running. 😉
Yes, new stuff works better but like said, when it doesn't, diagnosing can be pretty tough without expensive equipment and much knowledge.