Just read through all 103 pages, lots of info

i have a 99 sierra extended cab 4x4 with the 4.8. She runs good but a bit slow and im thinking about a 6l swap.

i read somewhere i want to watch what year motor i get due to the 99 having a different crank position of some sort, so which year 6.0 is optimal for my situation

also about the trans, Realistically a lq9 with a nice cam and bolt ons would be perfect for me, will the stock 4l60 hold up ? or will a full overhaul be in order ?

Thanks