360 cam question...

Car specs:
1966 Barracuda, 360 .030 over, Keith Blacks flat tops, Holley 650 DP, 727 auto, 8 3/4 sure grip, 3.55 gears - intended use is primarily street.

I measured my cam lift today with my dial gauge. I got an average of .279" intake and .294" exhaust of dial lift. Using the stock rocker arm ratio of 1.5, I get .418 intake valve lift, and .441 exhaust valve lift. I have no idea on the duration. So this is probably not the performance cam I am looking for to take advantage of some 2.02 J heads with some porting. I am considering the Summit cam kit 285/285 .480/.480 as its reasonably priced and approximates the 280/.474 cam in the 360 Stage 3 build found in How To Hot Rod SBM's . I plan on using stock manifolds due to the header issues that plague the early A bodies. I believe they are the original 273 manifolds.

What are your thoughts on the cam choice I am considering? What will its manners be? Is there a better choice considering I am using stock manifolds? Anyone have any experience with Summit cam quality? I know I will leave some HP's on the table not going with headers. But $1500 for headers and their relatively minimal gains puts them out of reach at the moment, due to other areas of the vehicle I am restoring.

Thanks