My first question is, is there enough cooling to handle a larger engine? Not much of a problem if you're in front but if you're buried in the pack it could become a problem.
Cooling wouldn't be an issue, the rad can VERY easily be swapped out for a factory 1000/1100 one as needed with a bit of steel, if needed.
IMHO, any wetsump bike engine in a 4 wheeled race car should at least have an accumulator.
I'll agree with this. I've got a few years of experience in FSAE now (and several more in BEC research/design), and depending on the engine you'll either need to top it off a bit more, install a baffle in the pan and/or an accumulator to prevent oil starvation in the corners, or (not necessarily needed but beneficial in several ways aside from cost/complexity
) a full-out dry pump system. I've got some SAE papers on both baffle and dry sump system design around here, if I can find them.
Installing an EFI system would be more of a scavenger hunt than anything else if you'd go for something like microsquirt, which would come away cheaper than most anything else if replacing factory carbs with tb's but would require a little trial and error unless you can find a number of documented builds/sources. If working with a factory EFI, unless you're ripping it all off and putting in a standalone (which is difficult on some bikes due to emissions/valve/etc. systems), it'd be good to know the potential and downsides of the factory setup. Any engine would need a re-map when totally new exhaust and intake systems are fitted, which something like PowerCommander would handle cheaply, if applicable to that engine, as I'm not familiar with those engines/efi setup nearly as much as yamaha stuff.