1/2 Drop or 2.5/4 drop? Which should I go with?

[chevymotocross]

I have an 87 swb rolling on p265/75/15 tires. They are pretty big tires I guess. They fill the wheel wells nicely with no drop but I'd like to get it a bit lower. I'm not sure if I should just drop it an inch in the front and 2'' in the back, or, if I should drop to say a 225 or 235 and drop it 2.5'' front and 4 rear. I can't do a 2.5/4 with my current tires, that's for sure. What do you guys think? Anyone have pics of trucks with similar setups?