Yes GM performance and edelbrock both sell a 4bbl intake that will bolt up to the vortech heads. As far as bolting the engine in everything else should be the same as far as bell housing and motor mounts. The only other problem I see is if you plan on using the stock 71 exhaust manifolds you will have a issue with the dip stick because the early blocks they were on the drivers side and late blocks the on the right side. If you're using headers there shouldn't be a issue.
Ahh, I see my partial mistake. I was thinking of the 383 stroker.
Ok, that kind of corrects my engine difference, but it doesn't say if the blocks are different. Still, you can bore a 305 block to 4.00" and turn it into a 350.
I think the blocks are cast differently and there isn't enough meat to boar it that much. If you could us racers would be cultivating every 305 we could get a hold of. And yes a 400 crank in a 350 makes a 383. We built a few of them in my racing days. I even built a 377 witch is a 400 block with a 350 crank. You had to be carful with the 400 blocks because the cylinders are siamesed and tend to have heating issues in a race application.