Hey guys, anyone here used the GM replacement engine for the 96-98 full size trucks? I see they offer 2 different Vortec headed motors. One is listed as a standard replacement with 2 bolt mains while the other is listed as a HD version which comes with 4 bolt mains and I believe different hardened exhaust valve seats. This motor would be going in a daily driver with occasional towing. Question is should I just stick the stock 2 bolt replacement in or grab the HD? Looking for any feedback from anyone who has bought one of these and installed, hard to beat the price and 3yr 100,000mi warranty. Cheaper than I could rebuild the current motor once I add in machine shop costs. Here is a screen shot of the 2 motors, prices and descriptions. Just happens both are on sale right now.