I'm needing some help with choosing a battery...not sure if this should be asked here or in the dyno section. I am plannin on putting my battery under the back seat in the boat I am building. Question is, what is the minimum cranking amps I need? I'm runnin a 13:1 505 bbc, msd digital 6, and a summit brand gear reduction starter. Any ideas on the amps or where to find a battery to fit under the back seat?