Battery ground wire and hot wire section

Hi guys,

I relocated my battery to my trunk. I faced fact the (european) relocating kit I bougth came with a hot wire with a too small section regarding its length (4.5m / 177in) : 35mm².
I plan to change it to a 70mm² wire (00 AWG). I guess it should be ok.

I ran a 25mm² ground wire (3AWG) from trunk to security switch, then from switch to tran bell, then from engine to frame.

My first question is: do you think I need to upgrade my ground wire to a bigger section one?

My starter is a ministarter but wired with the stock mopar starter wire. Is the section of this wire big enought for a mini starter? (Engine is a 383 with 906 cylinder heads, I dont have the exact compression ratio but it's not been stroked or bored)

Thanks from France,

Nico