Both the B&M and Hughes converters are good, between the two I would go with the Hughes.
Running 1.65 rockers will mean converting the heads to screw-in studs and clearancing the pushrod holes. Not worth the extra money in my opinion for a very small performance gain.
The 068 cam with 1.5 rockers won't be a problem with the stock press-in rocker studs, 1.65s will probably break the studs.
This is one of the main reasons I recommend the 068 cam. Folks running press-in studs and stock valve springs won't need to go to the expense and hassle of changing them. Plus it's a very nice running cam.