68’ barracuda tear down and rebuild suspension Q’s

I am researching different options for the complete rebuild of my 68’ barracuda suspension. I am planning on rebuilding a 350-400hp 318 meant for street driving and cruising on the weekends.

My current suspension is old and tired. I am strongly considering buying a super front end rebuild kit from PST Suspension with polygraphitebushings, new bill stein shocks, new torsion bars, new leafs.

My questions are:

Which width torsion bar should I buy for my application?

Am I forgetting anything in my list above as far as parts for the rebuild?

Are there any objections to this specific rebuild kit or company that I am purchasing from?

Any recommendations are appreciated, I am not trying to reinvent the wheel here. I just want a nice handling car that will do well in the windy hills I live in.