Hi All, wow Thanks for all the responses. Plenty of info here to be getting on with. In answer to a few questions the car already has a balanced engine and lightened flywheel so its not acceleration I have issues with, just how hard it is revving at sensible motorway speeds. The 4000 rpm reads about 77mph but a) the needle wobbles a bit and b) I like pies. For that reason the car has a 12inch moto-lita fitted which perfectly covers alomst the entire tacho and speedo (I can see 0 to 35pmh only)so like Graham I drive the car on engine noise more than anything...
Thanks for all your responses. Its clearly feasible but needs a bit more investigating. It sounds to me like diff changes may be my better first port of call, or second if checking the speedo calibration is where to start.
