[poormillionaire2]

2" primaries would be too big for you're application anyways. Most street cars use 1 3/4" primaries while some LSx guys run 1 7/8" primaries. With a whole 2", you'll lose a lot of torque down low. I have 1 3/4" pacesetter LT's and they work fine on my LT1. And Mr. Luos with his big-cube motor runs the 1 7/8" primaries and still hits 500+hp in high altitude. So, I think the ones you got are fine.

As far as removing the cam, if you do decide to take it out, be careful. Go slow to make sure not to damage a bearing, or a lobe. I don't know how far along you are with this project, but you will have to remove some of the valvetrain, such as the lifters, so they don't fall into the block when taking out the cam.

I don't think I could answer those other questions too well, as Morely already has. But with a cheap timing chain, it wares and stretches prematurely that could lead to problems later.