Complete Front End Rebuild
I don't know if this will help, but below is my "analysis" of some Poly Graphite suspension kits. I am getting ready to order a kit for my 67 Barracuda (has a 74 Scamp front suspension) in the morning so I have spent a little time this afternoon looking over things.
In comparing the components included in the PSC kit ($290) and the PST kit ($269), it does look like you get more parts with the PSC kit.
For the extra $21, the PSC kit includes an idler arm and inner tie rod ends, these parts cost an extra $60 from Rock Auto using Raybestos professional grade parts.
PST does offer the SUPER kit which includes the regular kit plus: Inner Tie Rod Ends, Tie Rod Adjusting Sleeves, Idler Arm, and 4 Upper Cam and Bolt Kits. The price of the SUPER kit is $439 for non 67 A bodies and $459 for 67's.
So based on this, it looks on paper as if the PSC kit is the better value. Please note, I have no prior experience putting kits in or dealing with either of these companies. I will be ordering the PSC kit in the morning and I'll be sure to report back once it is in and the car is running again.
**Please note, the prices that I'm using above are based on the 74 Scamp application.