Not really, unless you play around with the internals too. TB's on a standrad block only seem to get to around 190-200bhp. Given the fact 306's weigh pretty much the same as classic scooby's, anything about a turbo would still probably outpace a 306.
in a straight line maybe, throw some twisties in and.....
thing is even my 405 would give a classic scoob a run for its money in a straight line, they aren't that powerful and lose a fair bit in transmission drag.
Ask adam or CUJ about their blasts when the P1's brakes went off
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