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I recently purchased a '68 Camaro with a non-number's matching big block in it. The car has most of the factory big block peices on it. BB heater box, BB crossmember.It also has a datecode correct M22 trans. Is there any way to be certain that it is a true big block car from the factory without the original engine? Also, there is a hole in the dash under the ignition ket almost to the bottom of the dash panel. Was this for a big block application? I had a '68 L78 with that same hole but it had a knob and a cable attached to it. Any info on this topic is appreciated
 

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Assuming the car has an 8 cylinder model number VIN prefix (124378 or 124678) the only way to know for certain is factory paperwork. All of the bb-specific pieces can easily be added.

If the car was built in California (L VIN) there is frequently a body broadcast sheet (aka build sheet) taped to the top of the fuel tank. Unfortunately the engine code isn't listed but a few other codes are, such as radiator. Norwood built (N VIN) Camaros almost never have broacast sheets. If the cars was delivered new in Canada the GM zone office there can provide build info.

The trans should also have a partial VIN stamp. If the VIN is 124378N345678 the trans would be stamped 18N345678. The M22 was optional only on Z/28 and L78.

The hole in the dash may be for an aftermarket manual choke.
 
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