Thank you all for the good info, sorry for the extremely long delay in replying.
I have gathered or confirmed all my parts for the conversion to a Tremec TKX 5-speed behind my 350 chevy. While confirming all the parts to make the conversion, it seems my GM aluminum bellhousing and TKX transmission will be short of the stock shifter location, thus placing it in the vent/heater panel. I know this conversion has been performed by using the T56 and a small block chevy, but has anyone used the old school GM bellhousing and a Tremec transmission? My measurement from the back of my existing engine block to the starting point of the shifter opening in the console is 29.75". From what I can find on the internet and a call to a Tremec dealer, from the back of the engine block with an aluminum bellhousing to the center line of a 5-speed Tremec transmissions is 25.75". I am 4" short of making it to the start of the shifter opening. Can someone please tell me than I am wrong!