Am I right in thinking you're trying to put a Sierra elec ignition dizzy into it? I'd stick with the LJ one, I had a Sierra dizzy for a while and all it did was leak oil over everything, Highway-Star had the same problem.
LJ airbox on an F10a is pretty easy. You can redrill the mounting foot on the battery side so you can move the airbox closer. The other side will require a new bracket made or a new hole drilled in the guard. The OD of the carby on an F10a is slightly larger than an F8as so getting the boot over the end may be cause for a lot of swearing, it certainly was for me!
If you've got a good F8a manifold and carb then you can bolt this onto the engine and everything will bolt up. I like the F8a carb better than the 1l one. That saves you having to sort out the choke cable too.
I'd give you a hand but I'm down south for the next few months. If you still need help around the start of feb, let me know.
