awsome mate, really starting to look like fun now.
the carb thing will be a suck it and see thing really. but personally i really wouldnt advise the running of higher fuel pressure to overcome the fueling issue, thats a mega bodge that will eventually just ruin the carbs and cause mot failures due to idle overfueling. just raise the main needle and drill out the main jet if needed,
you will find that not many rolling roads will know what to do with them but at least they can tell you how its running.
im looking at modifying my mates hubs soon to give him a quicker rack, it seems like a much easier way of doing it rather than trying to get a rack to fit from something else.
you should port the head while the engines out mate