I have a 1969 firebird with power drum brakes. I want to know if a 1970 firebird with power brakes will bolt on? I would have access to the complete 1970 as a donor car? The reason I would go this route if possible is I may be able to get the donor car at a cheap price. Any advise would be appreciated.

I understand cheap is not allows the best path. ....

No. They changed the length of the control arms in 70 which changed all the front end geometry.

Thanks for the quick answer....back to looking again......

What parts will fit? will the power boster? and lines? Or is it just not an option and should look else where?

Not an ideal donor. Here's a list of donor cars.
Apollo 73-74

Buick Special Skylark 69-72

Camaro 69

Chevelle 69-72

Grand Prix 69

Grand Prix 70-72

Monte Carlo 70-72

Nova 69-74

Olds F85 69-72

Omega 73-74

Sprint gmc 71-72

Tempest 69-72

Ventura II 71-74

Thanks Jim....I will start looking....

There's a few more donors but they are similar to the list. That 'Olds F85' includes Cutlass.