I just picked up a nice std bore 1970 402/375HP 4bolt block. Whats really odd about it is the front pad is stamped T1021CKO and the vin next to it is stamped upside down 10K127365. Ive had 100+ big blocks and this is the first time ive seen this.....anyone else?????? THANX

That is totally correct for a Leeds Kansas stamped engine. That is the only plant I have seen this done at. Rest easy.