I have been offered these ported heads that have been sitting in a shed for 3-4 years, with light surface rust forming in the runners. In their prime they flowed 280 @ .550 on the intake and about 170-180 on the exhaust. They are Stage 1 replacement heads that have not been cut on the intake side, but were decked .040. Chambers are 64cc and the heads were used for 8-9,000 miles before they were removed. What would you recommend I do to get these heads ready for the street once again on a very tight budget?