forged or cast torque converter??

sorry I should have been more specific.

70 340 block

I know the crank is cast. it is a 72/73 crank. serial number 3462387

the HB that was on the car was not weighted.....the new one will be.

the torque converter is not weighted, so it needs to be replaced with a weighted one for a cast crank.

I cannot see the flex plate...is that behind the torque converter? on my 55 Packard the flex plate is visible and has the starter ring gear on it. this car has the start ring gear attached to the torque converter so i'm a bit thrown off as to where the flexplate is.

if I have to drop the trans anyways, I might as well get a better torque converter...2500 stall or there abouts, and make sure it is weighted and be done.

the whole reason to figure this out is that the car has a serious droaning roaring vibration....druuummmmm....druummmmmm.....drummmmmmm..drummmmmm at a certain RPM/speed. pretty sure its because the HB/crank/TC are not all matched correctly. I don't want it vibrating anymore.

I suppose I could put the new weighted HB on the car and then drive it to see if the vibration stops. if so...good I don't need a TC. if it still vibrates...then the TC is wrong and i'll drop the trans at that point