Buick Skylark Cars

Questions

Frame For A 1970 Skylark

Does anyone know what GM frames can be used on a 1970 Buick Skylark Custom?

ID This V6 Engine, Please?

This (late 70s era?) v6 engine is in a non-GM vehicle I just bought and I want to do some baselining. It would be super helpful if I could pin down the details of the engine.

1991 Buick Skylark Iron Duke

I have a 1991 Buick skylark that is an incredible condition inside and out, however the motor has a cracked block. Would it be possible for me to put in a D6 instead of fixing the iron Duke? Also...