If it's been with your dad that long, the tach is most likely original so you should check what the redline is as another clue:

427 - 390hp (L36 1x4)/400hp (L68 3x2) 6000 rpm

427 - 430hp (L88 1x4)/435hp (L71/L89 3x2) 6500 rpm

 

Barry,Barry, Barry,

Its just not that simple.

First he needs to acquire the properly aged tank sticker, POP, and PDI sheet That will be the only way to properly document the proper engine stamp, options, and colors for the car.

I would suggest just a garden variety L71 as the L88's and L89's draw to much scrutiny. Black with a red stinger red gut seems popular, and you can never go wrong with red/black. Of course the proper trim tag will have to be acquired as well.

While you're at it and since you already have a salvage title you might as well wash it and get the salvage designation taken off as described in an earlier thread. This would be the perfect opportunity to order up a new VIN tag and rosette rivets as well. 22941 would be a good number as then you would have the "Last" 67' Worth millions. Just ask TM

Now if you can get all the parts together and assemble it all typical factory production style and get it appearing as delivered you can get yourself a little ribbon and a nifty certificate to go with it. Of course this certificate means nothing as to the authenticity or value of the car Just that at one time when the the sun was shining, the birds were singing, and the planets were in alignment the car appeared correct and was assembled with typical factory appearance standards in mind. A snapshot of that day if you will.




All kidding aside, and whether its a SB, BB, or a straight six, If you get the chance to do this with your father do it.
It will make for great memories down the road. I know it did for me.

 

There are lots of clues to look for, the redline on the tach is the best clue. As noted it should be 6,500 RPM redline for an L71, L89 or L88. The oil pressure gauge should be 80 pounds for any of these options due to the solid lifters. If you have an 80 pounds oil pressure gauge, it is one of the big block options as there were no solid lifter small blocks available in 1967. 390 and 400 horse motors used 60 pound oil gauges.
Also, if it has evidence of heavy duty suspension (F41) it would have to be one of these HP 427 options only. Shocks may have been changed out (the rears are different), look for the number of leaf springs and diameter of sway bars. Seven leaf springs means F41, nine means standard suspension. Look for evidence of electronic ignition (K66), mandatory on the above three options, available on any Corvette.
We can go on, and on about fuel lines, half shafts, differential codes, ect. All these are clues to how your car was originally optioned, the more of these clues that are still intact, the better you can uncover what options and engine came in your car. I will say that without good paperwork verifying that the car was indeed optioned with a 427, it may be difficult to bring it back to original and recover your money. Paperwork is the birth certificate of a car and real documentation will help you realize the maximum amount for a car. Once it is restored, all these clues are disturbed and you will have to convince someone that it was indeed a 427 Corvette.

 

You chop a hole in the hood and slap a blower on it