hello, I'm wishing to choose a motor for my 53 3/4t (still working on the 1/2 or 3/4t). My motor friends in Aus tell me to pick a smaller V8, as the 350 and up through rods due to high revs. regulation in Aus says i can go as large as 454 as long as i have the braking compacity. i wish to do highway driving. any ideas