I have a 1978 cast crank 440 Bored 30 over, I think 30/30 crank might be wrong, and mild cam ....Which is externally balanced due to cast crank and harmonic balancer. I was wanting to know what torque converter and flexplate I need? Also what’s the difference btw having teeth on flexplate and having them on torque converter? Also I have already bought a mini starter for it but will that effect which on I need teeth on, and or what size of torque converter I can have? I haven’t gotten a 727 yet but I know I want an automatic.