A reliable 500HP Cleveland is a pretty easy goal these days, George has a sticky somewhere with recommendations on parts.
Cleveland EFI has been available for sometime albeit through small specialty manufacturers e.g. Cleveland 48IDA manifolds are readily available and so are 48 IDA pattern throttle bodies. Or there's the more conventional single TB style. Where needed adapter plates are available for intake conversions from Windsor base.
The modular motor just seems so much work to get anywhere close to Cleveland performance, that is unless you take Mark's example and go fit a Ford GT engine and transaxle that with a simple pulley swap your at +700HP.
Despite the extensive body mods, that is the way I'd spend my $$ if I was contemplating something wild, so many wrecked Ford GT's you can get a used engine and transaxle for under $25K now.
Julian
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