I made the plates out of 3/8" aluminum for the front plate and 1/8" steel for the midplate. I did not have to modify the trans tunnel for the midplate. I use a 1/8 spacer with the converter and the starter bolted up as normal.

1963 Belvedere 440 Max Wedge Tribute
1970 Charger R/T S.E. 440 Six Pack
1970 Challenger R/T, 528 Hemi
1970 Charger 500 S.E. 440 4 BBL
1970 Plymouth Road Runner 383
1974 Chrysler New Yorker 440
1996 2500 RAM 488 V-10 4X4
2004 3500 Dually Cummins 4x4
2012 Challenger R/T Classic.