turbo help

[GM Muscle]

I have a carbed 350 in my 69 camaro and im wanting to run a rear mount turbo setup.. i do have a few questions though.

1) should i go with twins or a single?

2) I currently have a set of stainless works long tubes. i know that the rearmount will take alot of stress and heat of of the headers but i also know the backpressure will generate alot of heat. i plan on running heat extractors through the fenders if that helps. are the flanges and tubes going to be thick enough to take the heat?

3) im also debating on running the inlet back through the interior of the car, through the firewall and straight to the carb. how hot do you think this plumbing would get? i would definately be covering with with some sort of console but dont really want too much heat soaking into the interior.

4) what are the opinions on having a separate stand alone oiling system for the turbo? like a small pump and canister setup? i have some really cool heat extractor tubes that i could use.

I will also state that im not really too worried about any small turbo lag issues or anything like that. the car is a stock weight sbc camaro, probably a 4l65e(shrifter) with a 2500-3000ish stall and ~355-373 gears
the car will mostly be a weekend warrior with occasional cruises and trackdays.. im not looking to make 1000hp or anything. maybe a respectable 600hp. we just put a turbo on my bosses car and its just great, all around fun.