10 Bolt 70 Chevelle- Weld RT-S 18x10 Backspacing

[Shiner]

I am looking to put Weld RT-S S71 wheels on my 1970 Chevelle (2" drop) and 10 bolt rear end. The car will have Baer SS4 rear calipers.

I do not have a tool but I am wondering what my backspacing will be... I am not mini tubbed. I am wanting to do a 18x10 with a 315 tire but I am thinking of going with a 305/40 ET Street...


ALSO is anyone on here a Weld Dealer that I could get a good price on these wheels and tires?

Any advice?