You'll never get 300 bhp all motor out of a b18b. The most I've ever seen out of an "amateur" (as in not pro drag) is 240 to the wheels. Set a reasonable goal- 215 is actually very respectable.
Just 12.5 compression ~ 10-15 whp, tops.
If you want 300 whp, boost it- 'nuff said. If you want 200+ whp, be prepared to spend at least $5000 inside the motor alone, in addition to bolt ons and the initial price of the complete motor, and steer clear of a B18A/B. Get a B18C (or an H22!).
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