I've searched the forum and saw recommendations for Moog springs to fit a 1968 442 Convertible w/ A/C. I have not seen any reports back on how the springs worked out, i.e. front end too high. Anyone able to discuss personal experience and which springs were used?

My original front wire is .690, while the rear is .550. Is Moog 5536 Front (.680) or 5450 (.690) combined with 5409 (.550) Rear a good selection that is about stock ride height?

 

I replaced the original springs on my 1971 convertible with Moog 5536 up front and the ride height was unchanged. I don't know if there is any difference between a 68 and a 71, and while I suspect there may be, I don't think the 5536 springs will disappoint you.Handling on mine feels much firmer but is not harsh.

Here's a post from 2014 with the ride height information I measured on my car with what I think are the FE2 equivalent front and rear Moog springs.
If you look at the first post in the link, there is info on where to measure.

https://classicoldsmobile.com/forums...de-height.html

 

That looks great with a slight rake. Mine has a/c, so will probably use the 5450 on front.
You used a different p/n for the rear than what I have listed above. However, it has the same wire diameter as my original spring. Will have to do some more research.

 

 

The stuff at Rock Auto seems to match my factory wire diameter and is for a/c. Note that the front 5450 is taller but with lower spring rate than a 5536 (12 & 450lb/in Vs. 11 & 487lb/in). Maybe not a bad idea to get a rake using the 5536 over the 5450? If you assume same weights on each spring (say 1600lb), divide by spring rate and subtract from free length, you'll find the non-a/c spring is compressed about .25" more. But, is also stiffer and that generally means better handling for peoples that like that sort of thing. So, lower and better handling with the 5536. Seems like the way to go even if it isn't "correct"....

Moog 5536 (Front HD w/o A/C)

• Wire Diameter 0.680 IN
• Load Rating 1985 LB
• Spring Rate: 487 LB/IN Constant
• Inside Diameter 3.63 IN
• Relaxed Length 15.06 IN
• Compressed Length 11 in

AC Delco 45H0071 (Front HD w/ A/C) - Same as Moog 5450

• Wire Diameter 0.690 IN
• Load Rating 1642 LB
• Spring Rate: 450 LB/IN Constant
• Inside Diameter 3.6 IN
• Relaxed Length 15.63 IN
• Compressed Length 12 in

AC Delco 45H2014 (Rear HD) - Same as Moog 5409

• Wire Diameter 0.550 IN
• Load Rating 847 LB
• Spring Rate: 143 LB/IN Constant
• Inside Diameter 5.5 IN
• Relaxed Length 13.4 IN
• Compressed Length 7.5

Spring Selection Tip - Do not use "CC" or cargo control springs on a car that you intend to carve corners with. The variable rate tends to upset the car if bumps are in the road. Constant rate is the way to go!