LS 5.3 in extreme dropmember QUESTIONS from a guy that doesnt know anything

[smartass12]

I swear i have searched and cant find a clear enough answer to pull the trigger on motor/trans purchase. (fyi im running nates extreme dropmember, and i will be asking him the same question but i know how busy he is). Originally i wanted to find an ls1/460le combo to run beacuse of looks(manifold)/power and seems more straight forward install for dropmember. But after searching and searching the 5.3 combo seems more in my budget. So far what i understand is i need to replace it with and f body oil pan (i assume the blocks are the same and its just a swap). Here is what i need (swap for dummies) info on..

So the accessories all need to be relocated because of clearance?

At that point will i be better served just ponying up for the ls1 because it will end up being about the same cost at the end? (i know that relative to what i wound be paying for the combos..roughly 5.3 $1700 5.7 $3200) ???