One of the other dads at our children's school has, or at least had, a Triumph 3500 with a holley carb on it and he reckoned it hogged the juice something horrendous.
Is the radiator overflow bottle from the GA15DE going to become surplus to your requirements? The one on my youngest's Pulsar is cracked and has a hole in it.
You're fucked. I've just recently replaced all those hoses on mine. You'll have to take the manifold off to reach anything. Check the distributor cap, rotor and leads while you're in there.
Is anything happening this month? I'm coming home to Northland for a few weeks to help out my brother who has broken his leg. Would be keen to attend a meet and put faces to names.