11:1 will work well with the 557 and it will make great power even with mildly ported E-heads. Think about a 2.19 intake valve and concentrate primarily on getting the mid lift numbers up, don't worry so much about the peak numbers.

I like the Indy dual plane (I run a ported Max wedge version on my 4.30 stoke 12:1 517 B) or the street dominator, the performer RPM is also a great intake but it is tall and limits your hood clearance and doesn't flow as well as the Indy 2D on a big inch motor.

Your short block makes the torque, the cam tunes the curve and the HP potential is the heads....get the powerband where you want it and if you want more HP upgrade later to some 360+ cfm MW ports and you'll make more big end and not lose any torque, only gains.

557 is a great cam, it will be very mild in a 511, at least the way I build them. 590 would work even better with no real downside on the street.

For street strokers I like a tighter (3500-ish) FB stall with a ~4400 flash...but your in a "race only" forum so the opinions are going to skew to the high side. The tight FB allows you to get more use out of the great torque but the flash puts you right into early side of the flat Torque Peak so even from gradual part throttle 'roll-on' the power comes on fast with great tractibility on street tires....plus it's more predicable and easier to modulate in all weather conditions.

PM me if I can help with any 'real street' combo type questions.