I think the 282S would work well with the 3.50 gear, and don't be afraid to step up the exhaust to whatever the exit size of the shorties is. However if you go 3.00, I'd go 270H or 270S. The 270H is a good cam and I think would do well
BTW, 114 LSA alone does not determine RPM range, intake centerline, lobe design and the rest of the combo all have a say in it. Personally, assuming you don't have too much compression, the 270H with stock hyd rockers would be maintenance free, sound healthy and run great on the street with either a 3.00 or a 3.50, especially if you have a decent intake manifold and a good curve in the distributor