Thanks Newbee. I think Andy has solved my problem, but will give that a go if it doesn't work.
Thanks Andy - much appreciated, and nice to talk to you.
No photos yet. The FB has been a daily-driver for a long time. Taught three of the kids to drive in it. Its now in the shed with the nose in the air while I work out the disk brakes (big ventilated disks that only just fit in the 13" Sampsons... whopper stoppers

). To be a bit different, I've kept the kingpin front end (this makes the brakes a bigger challenge). I've got most of the parts, and the block/crank has been machined for a while. Eagle Mitsi rods are ready, Ross balancer, crank girdle, dry sump tank and pump. Can't go much further (ordering forged pistons, moly pushrods etc) until the repro Repco head is done. Hoping for November. The magneto is all rebuilt, as is the McGee injection. Got some work to do on the McGee pump though as it failed its flow cell test. Banjo rear has been rebuilt with a slippery centre and bolted up OK.
Cheers,
Harv