Did you use stock spring pressures?
The stock springs and pressures suck for anything more than stock and the EQ mag heads are not capable of much lift out of the box unless you get retainers that allow more clearance.
Moparmagnum on here can get you the special retainers and locks good for around .500 or a bit more lift if that will be ok.
If you want a big cam you may need to have the seats and guides cut on the EQ's
There is also the option of valves with longer stems, but then you have to have different rocker gear capable of doing it.
(Lots of Chevy aftermarkets available for this fairly cheap if needed)
Personally I stuck with the 1.92 valves that came with the heads and went with the Hughes springs and special retainers, and that way I was able to use a cam a bit over 500 with the stock Mag rockers and even the stock roller lifters and pushrods.
The different cams long/short are for a mechanical fuel pump, as the long cam has the attaching point for the eccentric for the pump.
I have and always will run an electric so I used the short (Magnum style) cam as well.
It all worked out really well together.
