I think it depends alot on the class, most full size guys around here care about there setup, i run a roller 305 with a small cam, Holly 4412, 400 turbo tranny, and a ten bolt with bia and 4.11s currently, all get the appropriate lubricants, i usually run diesel oil in my motors because it seems to take heat a little better due to it's thickness
Currently piecing together a LS set up, i got a killer deal on the carb intake, and 6014 mad box with matching harness, as soon as i find a 4.8 or 5.3 it'll be going in a square body impala 300horsepower from the factory and 340 some torque, plus 4.11s should be pretty fun
I'm a big fan of the 700-14 tractor treads, you can get them on simple tire.com for around 55bucks a piece, free shipping, 6 ply, they grip really good, also the 23 8.50 14 skid steer are awesome, but there over priced and don't seem to grip as good IMO
You need to get on that full size band wagon and bring one down! Stanton has there derby in September, but it usually has around 30-40 mini, 20ish "stock" and 20-30 pro mod, Versailles also has a really good one, as well as Winchester