But if you still have the stock heads with old used stock springs, I wouldnt go to 1.7s unless you put on some new higher lift springs at the same time.
When I did my h/c/i I bought a set of Australian made 1.72 roller rockers. They're bolt down rockers, but each pair is mounted on a little shaft. They're pretty nice, but not worth the dough in most cases. For my application they worked out well.