For a real forged two or three piece rim you are looking at $400+ a wheel without tires. The ones you are probably looking at are either replicas or cheap wheels. There is nothing wrong with that though. Not all of us can afford to spend 1/4 the value of our car on wheels and tires. Find some you like and check for information on the seller or wheel to see how reliable they are.
Check those ones out. Also 2 brands of tires you may look into that I have not heard anything bad about, perform very well, and are not bad priced at all are the FUZION ZRI and the AVON. Check tirerack for info. That site is a wealth of information even if you don't buy from them. I bought the Fuzions and really like them so far.
The M50 manifold doesn't bolt up perfectly but can easily be done with a few extra parts if I remember hearing correctly. I have a 325 so obviously did not do this, but seartch around and you can find it. By the way i usually stay away from ebay for engine stuff.
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