Holley #8007 390 CFM Carb available from amazon.com for 321.94 and free shipping. Three in stock right now. Summit Racing is 346.95 plus about 10.00 handing charge. I say stick with the 390. Need a new water pump? Check out the Polished Aluminum Heavy Duty pump at Autozone.(BWP-386HDA) 63.99
Good Luck!
