most of the time you see them hooked to one trans.. one on each side of the spur so theres not much complicated there and as for fuel tank just run two tanks one for each engine....the tricky part is is hooking the linkage up right..the best way is to go with two slidecarbs and run a staight peice of linkage with two ball connectors on each end and hook the two carbs up making sure that when one carb is closes other is and so on, making sure they are both equal.. and then from there you can hook another linkage to your bell crank ...now granted that was just a basic run through..best bet is to just get a bunch of pics and copy what they have...