Cam, compression, and intake. 328, like the 2V 302 and 305 suffered from an emissions cam, low intake valve lift. They also had low compression. Install quench heads with zero deck pistons to get compression and efficient combustion, a cam in the 220°@ 0.050" lift and 0.500 valve lift, and a 4V intake and carburetor to wake them up.
Yep, basic hot rodding. Ford and Chevy did it. Mopar kept the Teen as a basic workhorse. Well, until nothing much else was left and they put them in a cop car with a 4 barrel and some 360 heads. :thumbsup: