If I find one. I was going to buy the top end off that 79 sport coupe eventually, and I hope it has a good PEVR.
Ive got a vacuume switch and a electric switch that switches on at like 3 inches of vacuume so I got the stuff to make an electric PEVR but I havnt got around to it yet.
Was just going to hook up a line going to the intake from the power valve port and put the vacuume swith inbetween. When the sensor picks up 3 inches it shuts the valve. It doesnt matter if it runs full ritch at 3 inches and up IMO.
Only thing thats stopped me is when I rebuilt my carb I adjusted the power valve and never completly adjusted it right. I hooked the power valve up to the plenum when I put it back on. It idled but wouldnt pick up speed at all. Ran out of fuel. If I eased onto it it would sputter and die. If id smash it it would run good for half a second, then die. Disconnected the line and it ran fine. Mine runs without a PEVR all the time. Havnt had any issues. Should pick up some MPG though.