Edelbrock valve springs

[hypermite]

I've got a Lunatti cam #60303, (268 dur. 494 lift) and Edelbrock RPM cyl. heads,the car has trouble pulling past 5500 rpm, I'm pretty sure my ignition problems are solved, I'm wondering if it might be the springs on these heads, .(Lunatti says the cam is good to 6200 RPM)

 

[bOb shingler]

do have the matching springs to the cam on the heads? i'd also think the that small cam is pretty much done at 5500 anyway but the intake may be used up at that rpm too. mayby even the exhaust is too small. could be these things if you have the correct springs.