A bracket type motor works just fine with no spread, in fact, a lot of cams use the same lobe on both intake and exhaust. As engine speed goes up there can be a benefit to changing the intake lobe and making it different from the exhaust lobe.

Typically on a high speed design, the exhaust lobe has more duration and a lot less lift than the intake but that isn't always the case. Sometimes the exhaust side requires less duration than on the intake.

Ryan should have a pretty good handle on that type of combination. If you don't trust him then drain $10,000 from the bank account to buy a pallet of camshafts and a month of dyno time and then you'll be an expert. At least you'll be an expert on your particular engine combination.