Don't get a 305 unless someone just gives you one or you want to save a little gas money. A carbed 350 is probably your best choice. Jumping straight into fuel injection probably won't be fun. Buy a donor vehicle like a running caprice truck or subarban. Be careful however because a lot of them have 305's and the owner may tell you it's a 350. With a donor vehicle you get a trans, cable, driveshaft, and many more goodies. If I was just starting out and knew what I know I would get one.