We urge caution. A coach repower is a complicated and expensive project. A new engine and transmission package "in the crate" could easily cost about $50,000. In addition, many issues would require resolution, including providing increased cooling capacity to handle the extra power. A more powerful engine may be physically larger and not fit within the space available, so frame or body modifications may be required. We expect that the labor costs will be both substantial and difficult to predict with accuracy. You might wish to take the substantial amount of money that could be involved and put it toward a trade for a later model coach, perhaps a 475 - 500 hp 8V92 powered Newell from the mid-1980s or later.
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Hopefully this helps.
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