[davz]

How long have you had the car?

How long do you want to keep the car?

If you do the weld, sell it soon or trade it in. There may be more cracks on the horizon, or if thhey don't insert the bolt holes, the headgaskets won't last.

If you go with the new engine, keep the car.

I would go with the new engine if you have the money.
The remanufactured engines already have the timeserts in them, and are about 3600 dollars on ebay. Or a new engine is just that - NEW.