I've gone for a moded accaim type engine as having invested in new carbs /manifold , new exhaust system and other items the thought of spending more money on these again to enable the instalation of a different engine would of made that option much more expensive and with it too time consuming. One of these moded acclaim engines powered a car to last years british sporting trials championship, beating various honda/suzuki 12 and 16 valve engines. To see more of these cars look at sporting trials.com or look at btrda.com and look up sporting trials.