I need some help with an issue

You’ve certainly worked with epoxy with all the porting you’ve done, you don’t need advice on how to fix it do you really?? and you have access from both sides of the hole to peen/dimple/rough up the hole, pack epoxy in there from both directions, feather it etc to where it ain’t coming out. It’ll be there long after the engine and car it goes in is junked/crushed. Let the buyer know and your conscience is clear.:thumbsup: