There is a factory GM ZR-1 cate motor right now on ebay.
From ebay:
$13,999
WELL HERE IT IS THE THE WILDEST ENGINE GM EVER PUT INTO A PRODUCTION VETTE. THE ALL ALUMINUM LT-5 LOTUS ENGINEERED ENGINE BUILT BY MERCURY MARINE IN STILLWATER OKLAHOMA. THIS IS A 1993-95 405HP 4 BOLT MAIN ENGINE STILL IN THE FACTORY CRATE. TOTALLY COMPLETE FROM BELLHOUSING TO ENGINE ACCESSORIES ( ALTERNATOR, PS PUMP, AC COMPRESSOR ETC.) COMPLETE WIRING HARNESS IS INCLUDED. YES IT EVEN HAS THE FACTORY IGNITION WIRES WITH THE "LT-5 CORVETTE" LOGO. THIS ENGINE HAS BEEN IN MY PRIVATE COLLECTION STORED IN A CLIMATE CONTROLLED FACILITY. IT WOULD DEFINATELY TURN HEADS IN A STREET ROD- RAT ROD. ALL AUCTIONS MUST BE PAID FOR WITH 7 DAYS, PERSONAL AND BUSINESS CHECKS WILL TAKE 10 DAYS TO CLEAR. I WILL RETURN FEEDBACK ONCE FEEDBACK IS LEFT FOR ME SO PLEASE LEAVE FEEDBACK ONCE YOU HAVE RECEIVED THE ITEM. I SHIP DAILY AND WILL USUALLY SHIP THE DAY AFTER PAYMENT HAS BEEN RECEIVED. SHIPPING WILL BE DETERMINED BY ZIP CODE.
Delivery to Corvettes of Carlisle is available in August.
93 - 95 CORVETTE ZR1 ZR-1 405HP CRATE ENGINE NOS GM | eBay