[bigblockv6]

I think it would not hurt to take away some of the rotating mass out of these engines specially in a light duty application, I would definitely take the 351M over the 305 engine. The engine will spin freer with less weight and that may actually improve in normal driving situations. The next time I build another GMC V6 I plan on using Chrysler 426 Hemi rods and have the crank ground and stroked for that but it will definitely be a 401 or 478 V6.