39702474 Holley throttle return spring
 

Here’s something you don’t see every day NOS brand new in package 3970274
This green spring was used on Holley carburetors high-performance models like the
70 Z28 LT1 , L78 , LS6
There was a repo available at one time but nothing like an original GM
$225.00 free shipping

The coil count is 30
You can see the reproduction versus the original. The original is in package never opened.