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1. Put in rear and spindles from Mopars with 4.5 inch patterns.
If you find a complete A-body rear axle assembly, why not swap the whole thing? Otherwise, if you find large bolt pattern axles you are facing the cost and hassle of getting them cut down and resplined.
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2. Put on 14 inch SBP wheels. (Essentially seems to be limited to 4.5 inch width)
Actually, you can get small bolt pattern Cragar SS rims as well as old slotted mags in 14 inch diameter and up to 7 inches wide. but you would't need it that wide on a stock car.
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3. Put in a Ford rear and whatever up front.
That would work, but you would have to make sure spring perches lined up and the overall width was close and the backspacing on your wheels allowed the tires to fit etc...
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4. Have the hubs and axles redrilled for a 4.5 inch bolt pattern.
So long as there is room, this is an option.
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5. Put on pattern adapter rings (to either 4.5 inch or 4.75 inch).
I have always heard this is a bad idea.
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6. Something I've probably forgotten.
If you find a set of 14 inch small bolt pattern rims you can take them to a local wheel making shop and have them turn the wheels into whatever width you want.
Shop around on eBay and at swap meets for old unilug rims, old slotted mags, old Cragars, etc... I have seen quite a few pairs, singles, and sets of fourteen inch small bolt pattern rims sell on ebay.
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Are there any really major drawbacks to any of these?
see above
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I can get all 4 corners redrilled locally for right at $200. That includes tapped studs in front. Is tapped better than pressed?
Sounds cheap enough, I would want pressed more than tapped, simply because I think it would be harder for a pressed in stud to pull through the hub than it would be for a threaded in stud to gradually work its way loose.
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I'm not sure what pattern adapters might cost or how easy they are to find. Probably about the same as redrilling, but solves some other problems like getting new drums and apparently very easy.
Bad idea. See above.
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I have a Mopar rear end spotted, but the gearing is 2.94, almost requiring a T-5 in$tallation.
Well, what are you waiting for? 2.94 isn't that bad, and with todays gas prices sounds actually pretty good. you can always swap gearsets later.
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Can anybody help clarify this mess with really super-brilliant (or not) answers?
I don't know. I would never call what I say super-brilliant. What do you think?