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If you've had problems with the belt wanting to creep over the edge of the cam sprocket or tensioner pulley then I'd want to make sure that's no longer happening. The crank sprocket guide plates will keep it from walking off the intermediate shaft sprocket. With the upper timing cover off, start and run the engine for a minute or two. If it continues to creep then shut down immediately. If it's a faulty belt (which may mean it's taken on a bad set from being folded or twisted in the package) then you could try flipping the belt over (the white lines would no longer be useful). You could also put on the old belt to see if it also walks. You of course have the tensioner bolt tightened with the washer holding the pulley tight to the block. The spring is just for initial adjustment. In the DOHC B234F the tensioner is hydraulic and floats. Also, double check that the belt has the correct square or round shouldered teeth. The later B230F engines switched over to using a longer life, quieter round toothed belt, but I believe your 1990 should still be using the square toothed belt. Mixups can happen.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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