I really need to breathe some new life into my trucks 400ci. I want more power. Or maybe more like 'the power back' My truck is a 1977. I have an edelbrocke 600 or is it 650 cfm carb. A friend of mine seems to think all I need to do is install some bigger cams. The engine is basically stock except for the carb and intake. My mechanic thinks my engine is starting to get tired as it's been blowing oil out of the breather for a few years now. 91,000 miles on the engine. What should I do?