One thing you might want to look into is a used low mileage engine if you really want to keep your beloved on the road.

There are lots of reputable used parts companies out there that sell good quality low mileage engines and transmissions, and most times they offer an initial warranty of 90 days or 3k miles.

You can also purchase and extension of the warranty up to a year , but I think it's a waste because if anything is going to wrong it will do it within the first 1k miles.

At my dealership we use LKQ Parts, we've never had a problem with anything they sent us.

It takes a lot to admit a mistake as you did by not doing regular oil changes, it is a hard lesson but going forward i'm betting you'll be at the shop when the odometer clicks over the 3000 mile change interval.