There is your problem. Someone changed out the rear, at one time to the small bolt pattern drum brake unit, or did a disc brake conversion. What you will need to do, to get the same bolt pattern, front and back, is to change the rear, to a 7 1/4 from a disc brake "A" body, or convert to a 8 1/4 rear.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

what size is the small bolt pattern? a 8 1/4 will bolt right in pretty much??

The large bolt pattern is a 4 1/2 inch bolt pattern. The small is 4 inch bolt pattern. A 8 1/4 rear from an "A" body will bolt in, be will need a shorter driveshaft. Take a look here.
http://www.slantsix.org/forum/viewtopic ... highlight=

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

5 x 100 mm. Almost, but not quite, the same as 5 x 4". The offset is usually wrong, too.

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"Mad Scientist" Matt Cramer
'66 Dart - turbocharged 225
My blog - Mad Scientist Matt's Lair

5x100 = Toyota Camry -91

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Lasse

Signet -66 225
Holley 600 Offy-5270 Dutra Dual,regrind. cam 272 0,420 110, head shaved 0.100 slight.ported
MSD6A
A904
7 1/4 3.23

wow

Just to restate: I would not use the 100 mm wheels, except as a spare.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

of coarse.