Sorry about the "JAP" remark, not meant to offend anyone, just Aussie slang.
The shifter is a B&M 04 GTO one I think in the end, had an MGW and that went in the bin without even moving the car because it was causing grinding in the box. Even did a G/Box swap at 3 in the morning and had the same issue. B&M went in at 8.30 that morning and fixed all dramas......GRRR to have that time back.
LSx originally covered the whole LS family, but yes GM Performance also calls it there LS version of the cast iron 454. And yes i do have one sitting here....too use or not too use....maybe for one weekend
The rear bumper is an Origin Streamline but filled the rear number plate hole, bit more strength and something different.
Thanks all for the comments, really appreciate it!