[Gasoline Fumes]

As far as I know, the valve issue is only on the 3-cyl engines. The rings should still be fine at 136k miles too. The front main seal isn't much more work than a timing belt replacement. Engine removal not necessary, but you might need to lower the front of the engine to get the pulley off. If you really do need an engine, you might want to look for a used one. If it's leaking oil on the belts, maybe the timing belt skipped a tooth or two?

The sound while turning and accelerating is likely the outer CV joint(s). About $60 each side for a rebuilt axle. Rear toe is adjustable on Metros/Swifts. But look for bent control arms first.