I will be contracting out the castings, probably use 356 alloy.

Yes with a water cooled IC, you have to have a radiator of sort, but that can be much smaller than an air-to-air IC.

Here is a picture of a casting I did. Would have been better, but I had no way to control the flow since I was doing it by myself without the use of any device to help support the weight. A sprue collapsed because I started pouring too fast.

[Linked Image]

It is better to make torque at high rpm than at low rpm, because you can take advtage of gearing.
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1994 4runner - SAS, 38 TSL's, Turbo 7MGTE swap, Turbo Tranny
Dual T-case, D44/D60 ront/rear