Cory,
I've had the SC apart down to the bare front beam. It's very much like the VW link pin except that it's structural on the 356. The beam is a welded part of the forward bulkhead and the shock towers strengthen the load bearing fender wells.
VW trailing arms are a bolt in since the have the VW logo and part number right on them. Uppers are unaltered, lowers have a badly welded bracket to hold the sway bar link. All four have a slide on metal shim to fit the inner diameter to the beam. The urethane "off road" bushing for the VWs can be substituted perfectly.
The rear has a different forward trans mount, and uses a "U" shaped engine support that bolts to the body above the trans to support the engine. The 356 "bell housing" has the same bolt holes as the VW with two extra on the sides for the rubber mounts. You could put the 356 trans into a VW by just using the four holes. If you raised the rear floor, you could mount a VW trans in the 356 and drill the bell for the extra two bolts, Easy Peasy.
The unsupported VW frame horns are a weak point in the system. The possibility of rustout in the fire wall and loss of strength for the "U" mount in the 356 is the weak point. The VW can be strenghtened and corrected with down tubes, the 356 would need backing plates and gussets since it's all sheetmetal construction.
The rear 356 shocks mount to brackets welded to the inner fender wells, in an area beneath the rear deck drip rails. Kinda prone to rust. The VW shocks mount to cast iron rear cantilevers which are a part of the torsion tube sub-structure.
What makes the 356 better in all ways than the VW is that it's a solid uni-body shell with every piece contributing to the strength of the piece to which it's attached. What makes the 356 much worse than the VW is that the uni-body shell is easily compromised and after fifty years, ALWAYS IS. There are no rust free 356s. Even a total restoration is entirely suspect.
However, the coolest part of everything is that a completely wrecked, burnt out, rusted, and then squashed 356 bare shell . . . is STILL gonna fetch close to $6,000. 'Cause that little piece of whatever is still intact and you can't find them, and the judges can always tell if you fabricated your own, and yours is rusted out.
Welcome to the world of REAL 356 Porsches. Don't TRY to figure it out. It's a world where the cars are known by their numbers. "I was working on #32466 this past week and . . . " and you're not aloud to paint them anything other than what's listed on the Kardex, and if it wasn't shipped with a radio, you can't have one in the car.
And then there's ME! Can I tell you how well I'm fitting in over at the 356 Registry Forum . . . ?!?!?