71 Demon 15 x 10 Backspace Question

I'm using those 8.5 centerline auto drags too. (Centerline called the backspace 4 7/8") with a bit more tire than that..... but I had to use .300 spacers to get the tires to clear. So, basically 4.5 b.s. Good call on the 4.5s
Are those on your barracuda avatar car? You will have a lot less room than my b-body car!