My 79 still has the stock engine in it, 88,000 miles. The time has come for some new parts, mainly gaskets and valve seals, but like everything else one thing leads to another. What I was thinking was.... stock bottom end- vortec heads- edelbrock air gap intake- comp cam hydraulic flat tappet- I use this thing as a DD and I need some more power, but with decent gas mileage. Right now the thing sucks gas, but the way I see it is that if it's gonna suck gas it should do it with some power being put out. The main question I had is what cam part number do most people go with? I was looking at the xtreme energy 12-238-2 or the xtreme 4x4 12-239-3 I want a mild idle with good response and good torque range.