Both are very good products - As mentioned the Lakewood is much larger in containment than that of the QuickTime. This can cause issues with headers, especially TTI units. The QuickTime bell housings are made from metal spinnings and are very accurate. The Lakewood is Hydroformed. I recommend the use of RobbMC offset dowels. (about $50.00) to dial indicate everything into place.
If you have any questions regarding QuickTime, don't hesitate to call Ross (owner of QuickTime). He's a great guy and he stands behind his products.
Tony Edler
Hurst Driveline Conversions.