Well "good street driving" is kinda vague and people define it differently, but you seem to be caught up in the fact that a performance cam won't pull like a freight train from 1000 rpm. It won't. But it's not a big deal, at least the way I define "good street driving".

When it comes to camshaft selection, IF max RPM is a big factor for you (that's OK...MAX RPM is a big factor for many people and many engines!!!!!). Then a good selection technique is to select a cam with a max powerband that matches your max expected RPM.

After all....why select a cam that's good to 6500 when you never expect to use it?

The Lunati 60303 has a max powerband of about 6000, it's therefore a reasonable choice for you BASED ON MAX RPM.

Now with that comes a minimum.....call it 2000. You have to live with it (at least in terms of THIS cam), but a powerband that starts at 2000 is pretty damn good, for a performance cam.

If you select a cam that's lower....you're rapidly entering the realm of low-PO / stock cams and you simply are NOT going to make big power numbers.

For example, you might find a cam whose powerband starts at 1500, but it's not going to make big power at 6000, and it's not going to reach your 550 hp goal.

This is an old dyno program, 440 with the small cam you want, 219,227 @ .050, & my heads that are close to the Trick Flow 240, this is gross HP.

Csk---where are you getting the 219 227 at 50 numbers. I don't know what the Lunati .050 numbers are but the .000 numbers are 268 272 ( I think)

This is the same 440 with the cam I run in my street car 512 cid
Hyd roller.

What's more important:
That the advice is good, or that you understand what took them years to learn?

People who spent their time helping you are beginning to notice that when they answer your question YOU ASK ANOTHER QUESTION.

Just wondering what the weight of your car will be with you in it thanks?

Just a little friendly advice, Nick. Remember, this is a free message board, and nobody is entitled to getting responses, yet you're getting a lot of great advice in your posts. You're asking a ten part question and basically expecting to get all the info you want, worded in the way you want it. You've already had probably 5 of the most knowledgeable Mopar engine builders in the country respond to your questions, and each has told you you won't get 550 hp with that small cam (regardless of stroker or 440), but best shot of getting anywhere close to that number with that cam, will be with good heads and a stroker. They have also offered up proven combinations that will for sure get you to that number and beyond, both with a 440 or a stroker, but it will require a more aggressive cam and with that, there may be compromises to what you consider being streetable. Unfortunately, thats it. There is no magic small cam out there. If 550/600 is what is most important (as noted in the title), its very easy to map out a combo that will get you there, just be open to cam choice and budget.

This is my 512, same as the 440, just has a stroker crank .I have not dynoed mine, but from the MPH at the track this is pretty close for a corrected for DA # 4050lb 1750 DA 11.33@ 121.1 in full street trim. this is a street car.