Rear shock length and options for Caltracs

Looking for ideas on shocks or plate modifications for my 68 Dart. My springs have been moved in board and I purchased the -1 mono leafs. I am 14 3/4” from eye to eye. I purchased QA1 TD901 and they are too long. I am considering purchasing the TS709 or welding up a new lower mounting point 2 1/2” lower than stock. Thanks Andrew