Well, a 67 SS would not have a 327. The SS were 396 only. This year the SS was easy to identify by the vin. 138 at the start indicates an ss
The grill should be correct, no emblem (about 10 inches long and skinny) or holes in the top of the grill.
No chrome trim running down the beltline of the fenders, doors and quarters. SS has one long rocker molding.
The hood should have a couple big lumps, accept no substitute, these hoods are very pricey to buy seperately.
The glove box should have an emblem that says Super Sport, not Malibu, see item 1 above.
An interesting often overlooked clue is to check for on an original big block car is the fuel line size, at the gas tank for the larger 3/8 dia. tube
* SS cars have the brake lines running through extra clips and are routing differently on the passenger's side of the front frame (this is to keep the lines from getting cooked by the exhaust manifolds). The brake line runs from the driver's side under the engine (like a small block) then shoots straight back towards the firewall and is held in place by extra clips then goes on top where there is another clip, the back towards the wheel).
Now the not so obvious.
Dash gauges, may or may not be there, these were an option and did not come standard on SS's.
Bucket seats are not a sign of an SS. They were an option and lots of SS's came with a stock bench seat.
A TH-400 automatic was available only on the SS, this should have an electric kick-down switch and wiring on the back of the carb.
Firewall should be painted semi-gloss black, or evidence should be there that it once was.
Rear panel between tail lights should also be semi-gloss black, or evidence that it once was, open trunk lid.
Motor mounts are different for 396, the fronts are rounded, with a deep grove in the top. Tough to spot.
Engine numbers and ident codes should be correct.
Accent strip on top of dash, (with ignition key in it) should be crinkle black, not woodgrain.
Front stabilizer bar is a larger diameter on SS.
If the cowl tag is pop-riveted on, keep going, it should have the correct open holed rivets.
For a complete inspection, the ident numbers are stamped on the top of the frame, behind left rear tire.Tough to look at, try a mirror, but it should be there.
The "rag-joint" on the steering column should have a splined and bolted flange, allows removal on 396 cars.
The power steering should have a remote fill canister bolted to the left fender and front rad support.
The rear differential should be a 12 bolt, count'em if you have to.
Check for extra support struts while you're down there, they go from the front of the rear control arms to the upper frame.
The rear panel beneath the trunk should have an SS396 emblem and no Malibu emblem on the right.
The SS396 Grill emblem should have a bracket that keeps it out flat, not tight to the grill like some cheap repos.
The ident number will also be stamped into the trunk lip well and is located about 1/3 of the way back on the side body lip (next to weatherstrip) should start with 138.
Still want more? http://chevelles.com/years/67/
me lovesum 67's