is this a good deal?

Personally, I wouldn't touch it for that price. The '85 slant will have a cast crank, hydraulic lifters, and more than likely is a one barrel. The transmission will be an aluminum case 833 OD that has the shifter pad too far rearward to use in an A body without making a shifter mount adapter or swapping in an A body tailshaft and housing. Sorry 'bout that.