Can an 87 225 from a dodge truck be swaped into a 67 valiant with a 225 in it? I can get the truck free with a 1 year old rebuild and the valiant motor is worn out.

Big YES

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Part of Tyrde-Browne Racing

But you MAY need a inexpensive crankshaft adapter, and flexplate, if the car is an automatic. If standard trans, might need a different flywheel.
Also, the motor mount brackets, oil pan, and oil pickup, need to be swaped.

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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

if standard can get flywheel cut to fit later crank

I have the needed adaptor rings... $20.00 + Shipping.
DD

Thank you. I will go get the truck this weekend and begin. Oh and both the truck and the valiant are automatic's. What is different on the back of the crank that needs the adapter? The size of the register for the flexplate?

Both being autos, makes it much easier. Yes it is the size of the crank register. Keep the 87 flexplate on the 87 engine, get the adapter to go in the crank register, and use the 67 trans and converter.
Your other option is to swap the engine and trans, as one unit. Unless the truck trans is a 727, then the driveshaft would need to be modified (shortened, and different front slip yoke).

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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