If it has only been stripped using the shorter bolts, then the longer bolts will grab on the new thread.

Personally, I wouldn't torque the stripped bolts upto the standard 70 lb/ft incase they strip again, 50 lb/ft with plenty of studlock/threadlock (the semi-permanant stuff) and you should be fine. Use locktite on the other bolts and torque them upto the manufacturers sped (70 lb/ft?) and you won't go far wrong there