shopping for a Qjet{7040257} for my 1970 olds 442. i was wondering what a fair price to pay for a rebuilt or one that needs rebuilding. also i am thinking it might take awhile to find the correct carb and i am desperatly trying to get this thing fired up. so what Qjet would work correctly on this engine to get me going? lastly does anybody have one they are looking to sell. thanks charlie,,,