CV joints, lobro vs push-in? (yep another Sierra diff question)

I've been reading up on Sierra/Granada diffs, and halfshafts after a few days think I know what bits are interchangeable... if we leave out BMW bits anyway!

Basically, has anyone here blown up a push-in CV joint? I have a set of reconditioned push-in CV joints, and am at the point of deciding whether to have halfshafts made to suit them or go for Lobros and have shafts made for them. The car's a Triumph Herald with Sierra diff and Rover V8 (~250hp) so plenty of torque.

Cheers,
Nick

PS Thanks for advice on fuel pumps, I ended up choosing a Mallory g-rotor design. If it works for oil pumps...