This is something that you really need to decide,,, but I give you my aged wisdom!
I know how you feel, been there many times. When you feel like your throwing good money after bad you just want to walk away. Just don't be too hasty in your decision so that you don't regret it later. I've done that on a few cars and really regret it now! I like my 93, but I wish I had kept going on the 84Z.
On my 84Z, I had built a 355 that was set for a 6-71 blower. Even without the blower in one year I broke a rear, DS (took out the exhaust and part of the floor), broke a clutch, wiped a cam, and broke 3 trans. When the trans broke the 3rd time it wiped out the remaining money I had saved to get the car backhalfed! I got so mad sold the blower to a friend and I drove it up and traded it in on the 93 and said THIS CAR IS STAYING STOCK. And where am I now? Sheet metal is all that's left stock! When I first built the 383 LT1 I pulled my motor apart 3 times before I got it right! All due to stupid little problems. Then it took an entire summer to get it tuned so I didn't get to drive the car for over a year. All I got to do was look at a big pile on money collecting dust!
Anyway, think about your car this way: If you buy another car and keep it long enough, drive it hard enough or start modding it your are going to be in the same place you are now. No car/engine no matter how well built will last forever, things will wear out, and things will break, and you'll always be doing something to the car. That's just the facts of being a hotrodder! And the more you push the limits the more likely you are going to break something! No matter what GEN engine you build. I work at a drag strip and I see everything from stockers to high dollar 600+ CI engines break, trans break. Stuff happens,,,,
What you need to decide is if you want to continue on this project, or start another. But unless you walk away from this hobby it never ends. I think you have it in your blood, you’re not going to be content with stock times, and you’re going to want to push further!
That means you’re going to be stuck in the circle of fix one thing and something else goes wrong. Our cars are NEVER, looking just the way we want, are fast enough for what we want, have all the toys we always wanted. The time we spend driving our cars is the time we get to decide what we are going to change next!
You've run into some really $hitty luck, no denying that! and there ins't really anything that can change it now. All I can say is just think hard about what you want to do.
If you do decide to waljk away from the car, then I would say to part it out, you'll get more money selling parts then trying to sell a none running car.
My .02
John