For the first 40,000 miles until the aluminum cylinders wore out they were great. Had the opportunity to purchase a Cosworth Vega several years ago. I passed because keeping it running properly would have been a nightmare.
I thought the Cosworth engine was different than the Chevy one.
You can dump the fuelie and put on Weber carbs which are pretty easy to tune.
Obviously that makes it non-standard but I doubt the Cos Veg is ever that valuable as a classic.