I'm gonna post up becuase you asked, "Is it worth the money?"
I don't know what you are building but here is my 2 cents, maybe 3 cents.
You said "FORD" dropped axle, is it an original thats been heated and stretched or an aftermarket Ford STYLE dropped axle? If you're lucky enough to have a straight OG axle thats been dropped I would try and find an original spring. There are a ton of them out there, CHEAP! Plus it would probably look better meaning more period correct if it will be visible.
If you have an aftermarket axle and some money to blow go ahead and look into the other spring styles. Remember you can compare most of your spring options from inside a SPEEDWAY CATALOG. If you don't have one of these catalogs you should get one.
My other opinions: (I''ve used all of these except for the Mono Leaf)
Posies SuperSlide springs - Great springs, cost a little more but a convenient spring pkg.
Mono leaf springs - Expensive, you better know your correct spring weight and ride height when you order one. I'm pretty sure they come w/shims to adjust height but how many will you actually need? Looks good chromed.
Speedway/Mr Roadster - Affordable, alot of builders have used them, you can insert teflon liners(available thru Speedway) between leaf springs or do it old school and and put some grease between the leafs to mimmick the Posies spring.
Trailer Springs - They work if you do your research to make them work. Compare 'em to the other springs. "Is it worth the money?" and the time.
"Is it worth the money?" In my opinion, "It's what you can have for what you are WILLING to afford."
Just something for you to consider or confuse you more!
Good Luck
