Around the time my 14B ws dying I noticed heavy knock in first gear and continually lessening knock as the gears got higher (43-1, 20-2, 8-3, 0-4&5 or similar). I replaced the turbo with a B16G and got a 2G manifold. For the most part things got better. For some reason I'm still seeing knock in first gear. Anytime I even come close to boosting I can feel the timing being pulled. I haven't been running it hard in that gear, but even in partial boost/partial throttle I'm seeing 20-something counts of knock. I get little to no knock in other gears.
*edit* It may be related to a problem I've been having where the O2 sensor reads 0.03 or 0.05 sometimes at idle, but seems to cycle fine otherwise. I changed O2 sensors with the turbo (one came with the new one). I had the same O2 sensor issue before and after the change.