There was a fully restored 67 427 tri power at our local concours a few weekends ago. Wonderful looking vehicle. The vehicle in the picture is not the tri power as the air filter had to be a triangle shape to accommodate the carb set up. It was also the last year for the c-2 series.
The 67-427 with side pipes was one of my all time dream cars. Of course one needs a ton of octane booster to run the car now as it had a Comp ratio close to 13 I believe. In fact one of the models I saw with the L-88 had a sticker on the dash which specified 103 octane gas be used.
The strange thing about the C2's was they only ran for 5 years. Almost every Corvette owner agrees the 67 Big Blocks were the ultimate Corvettes. I assure you that if GM still manufactured a 2014 version of the Stingray they would be besieged with buyers. I wish I had one!