I once put an Olds 350 with automatic in a 62 lwb,worked just fine.But if you want to use a 700r4 with your 261 you will have to get an adapter kit because it will not bolt up.
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Floyd


_____________
Floyd

If we choose being kind over being right,we will
be right every time.
Knowledge is a poor substitute for experience.
Remember what is precious to another, may not be to you, but it
is precious nonetheless.

1948 Chevy 2-Ton