Correct geometry, with antidive, Ackerman, proper Camber Curve, and no Bumpsteer are all designed in ALWAYS! If it won't work right - we won't build it!
One of the best ways to to provide a smooth ride is to minimize noise, vibration, and harsh-ness. Proper bushings and a heavy crossmember for strength and sheer mass combine to absorb energy. That's why a Bridgeport Mill runs smoothly, and a lightweight copy vibrates and chatters. That's why our crossmembers are made with 5/16" wall material - the heaviest in the industry. 3/16" top plates.
All our kits have the shock tower antidive angle and crossmember angle specially fitted for each specific frame, and have a 3 degrees frame rake built in. (We've found 3 degrees to be a very common rake angle) The only trimming required is a small shock tower notch. The simple fact is that these old frames vary in width, and this simple procedure actually guarantees that the shock towers are properly located on your frame.