All I'm saying is that a lot of folks put in a huge cam, don't change anything else, and wonder why the car is slower than it was.
(I think the 280H is an excellent package)
I put an XE274H in my 69 351 W. It was a dog, wouldn't even turn over the tires! Then, (it's a long story) after I found out all the specs and what the cam needed to work, I started swapping parts.
3500 stall? Check. 3.73 or higher gears? Check.
Now, it's hard not to turn the tires. I've got an RPM air gap intake and 670 holley,complete MSD ignition, shift kitted FMX and 3.89's. But, since I installed the cam without knowing all the specs, I'm afraid to spin my motor over 4500 for fear of ruining my valve covers.
The cam alone will not make it a race car, any more than putting a '750 double pumper' on a stock 289, even though Shelby 289's ran a 715 cfm.
You can't tune in a gear ratio, or a power band.
Sure, you can swap parts as you go, but it's better to have a clear plan and a clear understanding of what you want.