I think hydroformed scattershields are a better proposition and not that expensive, but if you want the cast kind read this:
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Wilcap used to do these but since Tony is no more the have got kind of spoiled.
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"In the late sixties Tony began looking at fuel economy. Like most things he did, he studied extensively and came to the conclusion that the answer lay in the diesel engine. By 1974 he was busy doing diesel engine swaps into Dodge Darts and Ford Pintos. The big Dodge got 42+ mpg and the Pinto achieved 50 mpg. Another conversion was to the Dodge and Chevy 1/2 ton trucks. Now, looking back, I wonder how much longer would the Pinto model been around if the fuel tank was filled with safer diesel fuel and would Chrysler have been in better financial shape in 1980 if they began putting diesel motors in their light trucks in 1970. One of my favorite stories from that period was about how he and the crew from Wilcap went to a ASE meeting on fuel economy. They sat and listened to the speaker talk all about the glories and promise of the hydrogen/gas hybrid powered car. The engineer spoke about the great potential and envisioned that after 10 years, may slightly more, of work and millions of tax payer dollars they could have a car that might get 35 mpg. The three of them had driven diesel powered cars to the meeting and the worst of them got 50 mpg."