Race cars take very little power to RUN........they take lots of power to START. If you have the appropriate alternator, those huge batteries with lots of reserve power, is just carrying weight for no reason. You need cranking amps and the appropriate alternator.

Have a friend who runs a twin turbo, big block radial car, on gas(which means intercooler and needed pumps) on two RC helicopter batteries banded together. The batteries weigh 3lbs.......for the PAIR

Most starting problems are the result of poor wiring and over 50% of cars are poorly wired. That big 00 starter cable does you ZERO good, if your ground cable is a 4 gauge cable, with a bolt run through an eyelet somewhere in the trunk. The cable is too small, the starter is NOT in the trunk and your chassis is one of the WORST conductors there is. The most bad azz starter in the world and a diesel truck battery won't fix that. The ground side MUST be as good as the hot side........few are