5.3L to 6.0L swap

[homemade87]

If it were me I would keep the 5.3 in the truck and do a cam change with a few supporting mods . Cold air intake , long tube header and a good dyno tune . You could see close to 300hp at the rear wheels ( depends on the cam choice ) . You being a manu trans you could get by with a little more cam . Don't by one off the shelf . Get one ground for your set up . Cost the same and makes a big difference .

Then I would put the 6.0 in the pontiac . It would make for a great and fun ride . You could go as far as you wanted with the 6.0 . I have a bone stock (stock 243 heads & custom cam) 6.0 with headers and cold air in my 82 that is 381 rwhp (dyno tuned) . Talk about fun to drive .