I thought you were going with an MII system on the Buick???

Your math appears to be correct--but my experience has shown that the only sure way to get everything right is to strip the existing front frame on the Buick to the bare rails, mock up the replacement front suspension, then with shocks, springs, and stabilizers removed, run everything through it's entire range of motion to verify clearances, caster, camber, toe-in, bump steer, Ackerman angle, roll center, etc....

Back in the late 70's, early 80's many people chose to weld on a Camaro subframe to their project cuz it was quick, easy, and cheap. Got to say that I saw more done wrong then I ever did see done right. With the Crown Vic assembly being the current rage, from what I've seen of them most appear to follow the same tendency. The only real + I see to using the Crown Vic is that it's cheap, but as with anything you get what you pay for!

I'm probably not the right guy to ask about using a Crown Vic, Camaro, or whatever grafted onto a car. I use either a MII system with tubular arms and all new parts or I design my own..... Sorry, but I've been at this stuff so many years that quick, easy, and cheap are no longer a consideration on the stuff I build......