Most engine midplate applications will require the installation of spacer washers inbetween the converter and the flexplate to retain proper pump ingagement. Pulling the converter back to the flexplate should be kept at a minimum, at most it can be pulled back .030"-.050" from fully engaged. Install a midplate shim kit or proper thickness washers to compensate for the thickness of your midplate. Jegs, Summit, Hughes, ATI, BTE, TCI - all sell midplate shim kits with various thickness washers that usually cover all applications but nice hardened washers work just as well if you can find them in the right thickness.