No harm in just ringing and asking for a quote - Brad's the person responsible for rebuilding my 4AG and has a lot of experience in motorsports, particularly speedway cars.
If he's confused, just say that 'Daryl' sent you - he may give a cheaper rate then. He's also flexible because he stays back some week nites after normal hours at the workshop so may be able to do some tuning outside of normal 9-5 working hours.
Let me know if the quote / price he gives you is / isn't competitive as I guess he'll welcome feedback of any sort.