difficult one , i assumed there was some problem with the original engine , its not that powerful at 145 bhp and going to one extreme , a volvo T4 4 cylinder turbo engine weighs half as much and can have nearly double the power with reasonable economy .
On the other hand keep the original all cast iron engine , The marine version with 3 stromberg carbs is 175 bhp ( same as the 164E injection version ) Or you could fit 3 x 45 dcoe weber carbs and tubular exhaust ...If you can find a 6 cylinder performance camshaft and a few minor head mods you could make over 200 bhp .( same power as the 960 6 cylinder ) however expect drastic fuel consumption!
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My comments are only based on my opinions and vast experience .
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