I have used the XE268H .477/.480 in a well used 350 and it ran very well and pulled strong. Largest cam that can be used with a stock torque converter.
I am running a 280H Magnum .480/.480 in my current 350. I use a TCI Saturday Night Special (advertised stall is 1800-2100 RPM). Very strong in all RPM ranges.
I also used the Comp Cam 'Kit' (timing chain & sprockets, lifters, springs and retainers & pushrods) with the XE 268H.
Installation was very easy. Break-in went very well. No problems.
I have not used any other manufacturers product to compare with.
Rear gears are 3.80-1 with 28" diameter rear tires. Trans is a rebuilt 350th with a B&M Transpak (Street version).