Where to purchase a A-500 / A-518

rmchrgr, if that offer was for me, thanks. Info is what I was looking for now. My purchasing power has dwindled after some purchase's and bills. (Tax return spending) A cheap working core would be great. Let me know.
It would be a big help in trial fitment issues/ AKA mock up.

BRONZEBEE Have you tried your local transmission shop?

Local shops will rebuild and some will do HP/modifying work, only if you have the unit. I have a difficult time find any shop storing transmissions for MoPars or any make really. Only unless it is a trans. that is known/prone to failure. AKA Ford Taurus and the likes.
There is a better return ($$$) to scrap them. Between demand and storage, after all, space is money, having what is most used/needed in stock is a better use of available space. They do what they can to have what is needed on hand.

383Duster Phoenix transmission in Weatherford, TX
Known modifier of tranny's? Web site?

UOP, what does the Mazda run?

UOP and everybody - I understand what your saying about ease of things. The larger trans. maybe a better idea on a few fronts. The intended car is a '79 Magnum, 360, mild mods to the engine. Exactly what the final configuration of the engine is will still need to be determined.

The target goal is a high performance drive with the abilty to go anywhere at anytime. Currently, the body work is on schedule to be started in a couple of weeks, as weather permits here in the North Eastern side of the states.
(While Long Island isn't the North East, a mere 20 miles separates us from this technical label.)

The A-500 is being selected for the smaller size and lower gear ratio of first gear @ 2.74, coupled with 3.55's in the rear. Tire size is currently and likely to remain 245/60/15 unless I find a wider tire with the same height. I find this a perfect diameter for the speedometer.
(Not exactly looking at this point in time though....)