Just to let you know...
the bits I scavenged off your Hunter are being put to good use (since last week I've fitted a *hot* heater with 2-speeds, 2-speed wipers, and fixed the waterloss with your rad cap More to follow soon )
we had a Viva years ago (a 1300 SL from memory), great little runabout - even with a snapped peg on the distributor drive.