1. they degreased the block for me and it looks brand damn new, was wondering if i didnt paint it, if it would rust or not?

It will rust a little. Spray the whole thing down with WD40 and it wont. If you want to paint it, use 1200* engine enamel.

2. what do i torque the aem cam gears down to? the 5 bolts around the gears that is.

15 ft/lb. http://www.aempower.com/faq.asp?fid=36&sid=&tid=5 Read the manual that came with the cam gears to be sure.

3. how do i push the crank sprocket back onto the crankshaft?

Put a 32mm socket over it and whack the socket with a hammer. Make sure the lip part faces away from the engine.

4. do i put any anerobic sealant around the oil pump when i bolt it back on?

Yes, follow the pattern in the 420a overhaul manual.

5. is there a torque rating for the oil and water pump?

Yes, definitely. See overhaul manual or chiltons.

6. do i put any sealant on the rear main seal?

No, but I usually put a paper-thin layer of grey RTV around the outside anyways. It's more important that you install it evenly.

7. what do i torque the arp headdstuds to?

According to the ARP catalog, 190,000psi 11mm studs are torqued to 90 ftlbs with 30-weight oil, or 71 ftlbs with ARP Moly lube (recommended). Check the manual that came with the studs to be sure.

8. Melling oil pump already primed?

Not really. If you want to prime it, squirt a bunch of engine assembly lube in there.