6.0, if you can find one for a good price. I picked up a low mileage lq4 shortblock for $600 and a high mileage aluminum 6.0 longblock for 725. Just keep looking and when you find one, slap on your yamaka and jew 'em down!

 

Will the lq4 6.0 block drop in easily if I buy a 5.3 truck Or will there be a lot of modifications to do ?