I have a reliable truck and I want to beef it up as much as I can without totally going broke. The 300 inline 6 is getting worn and starting to lose some torque in the hills and on the highways. What can I do in the line of adding loads power to that engine? I'm interested in redoing the top end anyways but can't seen to find parts (ie, intake manifolds and plenums) or even hi-po inside parts. I've raised the suspention to 3/4 ton and lifted it some. The power plant needs it now.