If you bond your alternator to your block you should also bond the block to the transaxle and the transaxle to the frame. You should do this even if you choose not to bond the alternator.
Those 16” fans draw 42 Amps each at 12 volts. What size relay are you using. If you are using a thermostat than your lower hose temperature should be equal to or less than the stat rating.
The Anti Gravity batteries have a nice feature in their BMS. If the battery is dead you can push a button and it will give you one more start. Don’t forget that you will need a different battery charger with lithium.