OK I'll chip in my 2 cents worth. As you would be aware, changing carbies on a stock motor would have almot no effect on the HP of the engine. It might be able to breathe a little easier through 6 venturi of the triple carb setup, compared to the 2 venturies of the twin SU, but not much gains there unless you cna make the engine breathe better. Meaning more extreme cams, bigger valves, bigger exhaust. To get decent horsepower you need higer compression, and/or more cubic inches. The V8 guys love telling you, "there is no substitute for cubic inches". but its more accurate to say that the more air/fuel mix you can get in the engine and the more you can compress it is what makes high horsepower. Thats why people go with the L28, cheaper gains to be had from larger engine displacement. and it has bigger valves. The L24 is hichly regarded because its a shorter stroke engine, meaning it can rev easier and higher. The L26 is basically and L24 with increased stroke (same piston diamers as a L24). and the L28 has the stroke of an L26 but with bigger pistons. I think is is possible to bore the L24 to L28 size and use L28 pistons and crank (aparenly on of the guys in WA had that setup in his race car). It would still look original apart from the carbies, but would be 2.8 litre engine. The car was basically undrivable on the street. If you want to keep it original, how about pulling out the motor, laying it up, and stick it in a crate and hang on to it. Then drop in whatever motor you want and do whatever you want to it. That way when the time comes to put it back to original you have the original matching numbers engine to put back in, if you are concerned with resale value. If you are going for a bigger engine Heres some homework for you: http://www.geocities.com/inlinestroker/ http://www.geocities.com/zgarage2001/z.html