I think what we're looking at in the pic is one of four ears on the cradle that have a machined hole for a mounting bolt that attaches the assembly to the frame.
Having an even tougher time now understanding what the problem is.
That's just his side of the story. What's the other side? (Hint- read the whole story over on CF)
Machines break. That's why there's a warranty.
GM honoured the warranty and in fact went above and beyond.
It reflects badly on the OP to see that he never returned to provide an update. Seems that GM made good and he's driving a new Corvette. CAC was just one of several Corvette sites he bombarded with a one sided story.
The rear suspension on a C2/C3 is quite complex meaning there's a dozen spots which could go clunk. The spring is not one of them unless one or more leaves are broken but it's most likely that other signs would be present.
Have you looked at all the rubber bushings?
Careful with horsepower claims. The 180 that GM states for your car is SAE net. Crate engine and dyno numbers are stated in Gross HP (no mufflers, air cleaner, drive belts, accessories etc). Sometimes there's 25% difference so perhaps your 315 expected HP would be closer to 235 SAE net. If...
A rubber hose of any type between the pump and carb is a fire hazard just waiting it's turn. The correct metal lines are readily available, I'd use those.
You can leave the trailing arms in place but pretty much everything else has to come off. The biggest challenge is usually separating the crossmember from the frame.
The spring appearing to be misaligned is normal, everything will line up during assembly.
The piece coming out of the diff is called a side yoke or just yoke. It should not come out of the diff as there is a small internal clip to retain it. Yours has probably worn or snapped off. Now is the...
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