Bottom line, fit diff bolts. Most LSDs come with diff bolts, so if you're fitting one of them, happy days.

They can break first gear on hard launches, but the way around that is to pre-load the clutch before you launch. This takes the slack out of the 'box and removes the shock loading.

Tim B's Mk1 Kjet Turbo has done a heap of drag strip passes (ran a best of 12.99, so it wasn't slow) with sticky tyres, 2-step burnouts etc etc and had a real hard time without breaking anything. But it was running a Diesel 4spd with a welded diff and ARP diff bolts.