Auto to Manual? (Sort of)

I'd start on that mess with a plumbing pipe brush, & it looks like a ridge part-ways down the bore, that may not be finish reamed to size. You have to drive the bushing in yes, & if You are persistant enough, it's possible to drive a bushing into an un-finished bore.....the shaft end will not go in however because it swedges the bushing down.... Gauge the bushing & bore after cleaning & before pounding away.