Just so I'm 100% clear on an 8 3/4 swap!!!

Sdriche said
it was a slant 6 car. Does that mean i have to swap leaf springs as well? I was only only going to swap rears

Probably not BUT, you could check the parts catalogue and see what it says.

My 67 dart has the rally package and I have stock 6 leaf springs. I think without it you get 5 leaf