Hi I’m new here and I’m starting what I think will be a 3 year build, mainly due to the cost. I have a 1967 GMC C20 Fleetside that has a running 305V-6 and a 2spd powerglide transmission, it all works but will need complete rebuild. My Plans for the truck is to do a complete off frame restoration and keep as much of it as I can stock on outside and to make it a safe and comfortable puller for a travel trailer and an everyday driver with some git up and go. My dilemma is to keep the 305 V6 which is fairly rare and that I know nothing about its performance or to swap it with a 454 BBC and TH400 I have from a 1989 GMC rust bucket. This motor and transmission also run but will need rebuilt.