Old horse new beating cam question

I know this question gets asked more than probably any other. And I know there's a hundred or more opinions, but here goes. My son after constantly saying he would never deviate from bone stock numbers matching car has realized it's just a car, enjoy it and make it fun. Besides we have industrial shelving to store the stock parts on, and can always be put back on. So we swapped out the 7.25/2.76 rearend to a 8.75/3.55, he wants to use an edelbrock 650 cfm electric choke carb, edelbrock performer 318/360 intake. As that's already on the shelf. The next question is of course cam selection. He really doesn't want to have to change the valve springs, and isn't looking for drag strip performance, but a mild street daily driver car. And he does drive this car 365 days a year. Is there a cam out there above a stock OEM grind that doesn't require bigger lift springs? Its not the end of the world if we gotta change them, but he really doesn't want to. I think his stock springs are at 380 lift. With most cams I've seen needing spring rates in around 500 lift. So any recommendations? 318/904, 8.75/3.55, 650cfm, performer intake, dual 2" exhaust with 40 series and x-pipe.