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"A" scratch on back of block in bellhousing area
Unfortunately, 390's and 428's share all of the external componentry in the 66 Tbirds. The only external positive identification is in the back-bellhousing area of the engine (but the engine and tranny would need to be removed for you to see it) . There you will find an "A" scratch cast-into the block for a standard passenger car 428. Otherwise, the casting code should be C6xx (as in C6ME for example) at least, because 428's started in '66. So you won't find a 428 with an earlier casting code like C5xx. I think you'd have to look and see if the engine looks all original and make your best guesstimate as to wether the 428 is still in there or not. Is the seller providing receipts? Good luck!
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