1970 Duster Starter Wire Wiring - Does it Matter?

Dart67 thanks for your wealth of info. After your post I went and checked and the square terminal wire goes to the starter as it should. Also my car is. 70 340 4 speed car. Just one basic question. Can I leave my heavy gauge wire run to the starter, run a new wire from the starter to the lug on the relay, and all be good? I understand it is suppose to run to the lug on the relay then down to the starter but does it really matter? It would be tough to get that big stiff wire on the relay lug. If I have your blessing, what gauge wire does it need to be?