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The 403 would be a drop in,with no mods. If I remember right,the 260 came with the TH350 trans,so no problems there.
403s were built from '77 to '79. I usually buy a rusty,running, 403 donor car.
They were availible in Buick B and C cars,and Pontiac Trans Am also.
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Bill Hutchison
'81 Delta 88,403,TH350,3.23 Posi.
'84 Holiday 88,403,TH350,2.41.
'95 GMC Sierra 1500,2wd,X-cab sb,350,auto,3.73.
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