Here's a really nice stock 350 Buick intake ready to use. I don't know exactly what year but I am guessing 71. You will need a new thermo choke. $100 shipped to the lower 48. If you want to pick it up in Bowling Green on either Wed or Thursday, 5/11-13, of that week I'll knock off the $50 freight. The 71 is sold but the 76 is still available. Paypal or cashiers check OK. I also have another 76 intake, pictured below for the same price. It came with a 72 motor but the numbers say it's 76.
The numbers on the 76 intake are B-1249169-2 Thought it was a 72. I also had a chance to take a picture.
I'll do some searching to see if it will fit. Maybe I'll post a thread. If It'll fit, there's a good chance I'll buy it. Do you have a carb too?