Couple simple questions need simple answers

will this fit on my 1990 integra rs hatch http://www.skunk2.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=413-05-1525&Category_Code=EXSACU&Product_Count=0

I dont have a heat shield on my cat, and my engine started to overheat a little, would this be the cause, or is it antifreeze/radiator/low oil (not saying i have low oil/antifreeze) because i thought that it had nothing to do with the motor overheating but im not sure..

Would a b18a 120kmiles, just intake/headers/exhaust, be able to handle a turbo? or is that a bad move on stock internals?

With $600-700 what upgrades do you recomend if i was not gona turbo the car, or which motor to swap with for less than 1,500 in the long run

Thanks

personally i would save my money.....i dont know how you're going to turbo it and keep your I/H/E because almost all of that, if not all of it will have to be replaced once you boost. The only thing you could keep is the exhaust if it is at LEAST 2.5".

Stock internals will handle a good amount of abuse if the engine is in good condition....check the sig...that's about ~300whp once it's tuned properly