Appears your original engine is on ebay.
1967 Corvette 427 "351" Block 390/4 Speed. Standard bore with vin # never decked or bored. 2 bolt 390 4 speed. Can be used for 400HP as well comes with 7 original GM pistons & rods, standard oil pan, timing cover & balancer. 1 cylinder has piston damage & will need to be bored or sleeved, hence the 7 pistons & rods original to the engine. Caps are great condition. March 1967 Casting.
eBay item number:183648811568
https://www.ebay.com/itm/1967-Chevy-Corvette-427-Block-351-390-4-Speed/183648811568?hash=item2ac2527a30:g:lC0AAOSwvwRcPjT z:rk:12
f:0&vxp=mtr
Seller: Petillos
Location: Vacaville, CA
194377S116062
194677S116062
1967 Corvette 427 "351" Block 390/4 Speed. Standard bore with vin # never decked or bored. 2 bolt 390 4 speed. Can be used for 400HP as well comes with 7 original GM pistons & rods, standard oil pan, timing cover & balancer. 1 cylinder has piston damage & will need to be bored or sleeved, hence the 7 pistons & rods original to the engine. Caps are great condition. March 1967 Casting.
eBay item number:183648811568
https://www.ebay.com/itm/1967-Chevy-Corvette-427-Block-351-390-4-Speed/183648811568?hash=item2ac2527a30:g:lC0AAOSwvwRcPjT z:rk:12

Seller: Petillos
Location: Vacaville, CA
194377S116062
194677S116062