Fox Timing Chains, Valve Springs & Cam Material

Title says it: Three areas I need some advice/opinions on.

1) Currently run a Melling chain, nothing wrong with it, but its been through 3 cams and I want to replace it this go around when I do my new HCI. Melling recommends not exceeding 6500rpms, which is the max I want to spin my stock block to anyways. I also read good things about the Cloyes timing chain.

-Question: Are the basic $35 timing chains from these companies reliable enough to take the abuse of a street/strip stroker that sees 6500 rpms, or do I need to spring for one of the more expensive $100+ sets?

2) Current springs:
Dual Springs
1.86 Install Height
145lbs on seat, around 350-360lbs at .600
Coil Bind at 1.09

-Concern/question: Pressures are good. Even if I run a .600 lift cam, I get .170 coil bind clearance (if my math is correct, and I understand the valve spring concepts correctly). I am reading that this is way too much and can cause "spring surge". Thoughts, opinions? Is this too much?

3) Cam material, billet versus sadi core. I currently run HV oil pump, arp shaft and stock distributor and stock distributor gear. No cam picked out yet. I have run both cam materials with no problems, currently run a billet piece. Is there any truth to sadi core cam gears being eaten when running HV oil pumps? Do I need to ensure I get a billet, or drop down to a standard pump?

Thanks in advance with the help guys!

Joe

Gear drives are noisy, and from what I've read, transfer more harmonics into an already weak block. Secondly, both are more costly than the aforementioned $35 pieces. If I was going to spend that much, it would be just as reasonable to purchase a very high quality traditional style timing chain.

Joe