68 C10 Tire and Wheel Sizes

[Pzary3233]

Well after searching around this forum for what seems like ages I've started to narrow down what I think would work well on my '68.

My front suspension currently consists of previous owner cut front coils and heated rear coils. This is being taken out for a proper 5/7 drop. 2.5" spindles and 3" springs up front and 5" springs and 2" blocks out back. Keep in mind I do have the narrow 68 rear end.

I have a pair of 15x8 truck rallys that I used to measure. And it looks like my wheel size is set but I am not sure on the tire size. I'm concerned my front tire choice may be a bit big.

Front: 15x8 4" backspacing and a 255/60-15
Rear: 15x10 4.5" backspacing and a 275/60-15

Mondo's truck was what did it for me:

His truck is basically a 4/6 drop and 15x8 4" BS and 15x10 4" BS

Any input would be greatly appreciated!

Thanks!