Originally Posted by
glennsexton
Welcome to CHR!
All of the accessories will bolt up from the 305 to the 350, AC, alternator, power steering pump, water pump, pulleys, etc. I'd invest in a new water pump simply because the one on the 305 is 31 years old. The alternator may be a good one to swap out as well as new belts and hoses.
Carefully clean and label everything as you disassemble - take lots of pictures and write everything down. Make sure you disconnect the battery and remove it before you begin removing the accessories as a quick short to ground can make a real mess of wiring that's a pain to replace.
You'll need a different manifold for the 350 - not due to size - but to go back to a carburetor. I'd recommend a Weiand spreadbore manifold and a fairly stock 750 Quadrajet (Summit Racing is a good source).
I'm assuming you have access to a garage, an engine hoist (you can rent one as well) and a good engine stand.
Assemble all your parts, ask us lots of questions and you'll be just fine.
Let us know how you decide,
Glenn