I think you missed my point
You could pick up a complete 18 degree motor probably as cheap or cheaper than trying to build a shortblock for the 18 degree heads you have. I think my friend picked one up for $6500. Intake to oil pan, dry sump, bowtie block with the best internals made. Sell the stuff you do not need.
To spin a motor to 8000 rpm you will need all the best stuff anyway. I think you will find that is going to be an expensive motor to build and to make the power you want and it will be pretty ragged until about 3000 rpm...then hold on.
The tubo thing is going to be real expensive.
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