Darren,

 

First I would do some testing to see what the problems are. On most of these cars the performance is way off what it should be just because parts are worn out.  On the engine, first adjust the valve lash. Check the valve stem lengths and see if they are relatively even - this will check for valve seat erosion. Check the cam lobe lift to see if they are even. Worn cam lobes are very common on these engines. Do compression tests, and then go to a leakdown test if the equipment is available - this will give you an idea of the condition of the rings, cylinder bore and valve seats. Check the distributor by pulling the cap and trying to move the rotor shaft back and forth - if it moves much then the distributor is worn and needs to be replaced. Put a timing light on it and check the timing. If the mark moves around a lot, then that is another sign the distributor is worn out. The SU carbs are usually worn out and leak air around the throttle shafts. Take the radiator out and to a radiator shop that can check its flow.

 

Once you have done the above your will have a better idea of what is going on with the engine.

Next look at the suspension and brakes.

 

Please let know if you have specific questions.

 

Regards,

John

Vintage Performance Developments