POR-15 the floor. Make sure you get rid of the rust and what not, then POR-15 it to last forever.
No LS1 huh.
Lt1 is ok, with some LT4 parts and what not, they can be pretty commendable.
EDIT: some suspension work can make those things handle pretty damn good as well. You can surprise a lot of people with them.
if i could, i would drop the 6.0 LS series out of the new GTO. But feasablitity (sp?) for insurance, and just crusing around would be too much, plus the cost of the actually motor. I also need something that will bolt up to my 700 R4