good evening fellows, i just have one question tonight. On my 67 400 4 speed car, what numbers do i check to see if it a real matching numbers car? the previous owner was a very elderly gentleman and he said the drivetrain was all original. i believe it is a real 400 4 speed car as it has the right bumper, grilles, decklid and they are worn enough that they look original. also, it has dual traction ars on the rearend. if you could tell me what #'s to check, where the are located, etc. i would truly appreciate it. thanks

also it has the 400 hood

You need to get a copy of your original factory documents from Pontiac Historical Services. Your main concern, having the original engine block, cannot be determined exactly without those documents.

Pontiac did not stamp the VIN number on the front of the engine block until sometime in the 1968 model year. However, your PHS docuements will have your unique Engine Unit Number which IS stamped on the engine block and can be used to verify if you have the original motor.

You can use the number crunching info from this site to verify cylinder head and engine block codes along with date codes for the other drivetrain components.

As Salmon said above the EUN on your block will match up with the EUN on your PHS report if it all original. It is the 6 digit number above the 2 letter code on the front left side of the block as in this pic.
Also the original rear end 2 letter code will be stamped on the back side of the drivers side axle tube. A little sanding or buffing should find it. The codes are on this site along with other '67 codes you can track down.

https://firstgenfirebird.org/firebird/1967/id_numbers.html