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250rwkw in a blown stock not rebuilt 5L is a ticking time bomb....
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I was running 10-12psi on stock 5L(had a cam) 250ish rwkw for maybe 2 years and then I decided 355 and asked engine builder the condition of motor when pulling it apart and he reckons it was fine still had life in it.
decent idea. try get that clubby for 13-14 sell urs for 6-7. it says it has high km, so chuck in a 6 liter engine for 9-10 and u have yourself a hell of a car.