I have an issue with trans to flex plate

Hi guys I appreciate the ideas so far
Yes it is definitely a LA block and not a magnum block
I will need to get under there and do some measurements to be able to answer some of the questions
I have checked the bell housing to block bolt as that was one of my first thoughts
The torque converter bolts are 7/16th as I did have to helicoil one that was stripped
The mini starter came with a shaped steel plate to put in between the starter and the mount to spacer it, I have tried with and without it, as well as with and without the dust shield

I will get back about the other suggestions as soon as possible, Iam working on the car under a carport with it elevated on axle stands as my garage is not big enough to work in or have the luxury of a hoist, the whole car was built either in the garage or under the carport from a paint less shell