[C10 - C90 Bill]

In my opinion, I don't believe the power difference between a 327 and a 350 would be that much different to justify the swap, unless it's wore out, lol. By the way, what year is the 327, as I don't believe they were available in '73.

Also I'm not very knowledgeable with Autos, but I way say that the 4l80e may not be strong enough for a big 2-Ton truck. If a truck of your size had an original Auto, I believe it would be an Allison.