I have a 66 289 with a C4. This 65 mustang was originally a three speed car so the clutch mechanism is still in tact. I would like information on the type of 4-speed that would be best for this car and what I should be looking for when purchasing one. Any ideas on cost would also be helpfull. I also would welcome any information, suggestions or procedures for the swap or any other helpfull info. Thankyou.