I'm just going throught the same process by removing a Banner battery on a later x-flow chassis with the 'Y' shaped tubes under the battery tray. It does mean carbs out I'm afraid if you have a post 92 chassis with a X-flow. I'm replacing it with a Powervamp PRV25 battery which is so small that in future I won't need to take the carbs off, as the battery will drop out from under the car although I need to make up a much smaller battery tray to hold it. These PV 25's have 'captured' acid plates and therefore won't spill anything nasty out, (you can fit them sideways too) and they have a very high cranking speed good for hight compression engines, and an 8 -10 working life, but they are more expensive, and you can't use some battery chargers with it as too much voltage will kill them instantly. So its either a trickle charger or one of th 'smart' chargers which only supply just the right amount of current to match the battery charge state.