Quote:
Originally Posted by 64skylarkls1
I hope others chime in here but I'm afraid you may be putting the cart before the horse. 18 x 12 means you will need to at least mini-tub the car. The order in which this should all be done is: Figure out which brake package you will go with as this can make a difference on wheel size and offset. Then buy the wheels and tires so you have them for mocking up. Next, tub the car and possibly the frame to give the clearance needed to fit the wheels with the desired ride height. Once that is completed, you can measure from wheel to wheel to come up with what rear end width you will need to make it all work without tire rub. Tubbing can also influence your suspension mounting points and configuration.
Bottom line in my opinion is, work with what you have until you plan on doing the whole rear of the car or you will likely end up pruchasing your rear axle twice. "A" has to come before "B" in order for "C" to be possible. The only other option that can really help you plan is to find a car like yours that has the set up that you desire and hopefully the guy will let you copy what he has. That can be a huge time saver. Not many have done Skylarks like mine so I spent countless hours measuring, ordering wheels & tires, measuring and ordering the rear axle. Even without tubbing it it takes a lot of planning to get it right. I am doing my LS six speed swap right now.
Many kuddos to you - in the "texting" generation yet getting into some real American iron!!!! 
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Thanks! I really got to start doing my hw!haha Thanks for the insight, this is my first car so I'm going to need a lot of it!