Your project is over the top , looks great . Many years ago I had a 67 fastback I put a 426 Hemi in, this was way before any of the great kits were thought of . I just wacked off the hemi mounts off of a 65 hemi k member and set the motor in place and welded them in .Found a set of the factory headers from a wreaked SS dart and massaged they in place . Things were so much cheaper back them . I have one thought to pass on to you . Your picture showing the spark plug wires have the small boots for the plug tubes , the big boots were used to keep dirt from falling into the tube and going into the motor when pulling the spark plugs , just thought I would mention it . Hate to see anything get ruined with your project . Anyway great work . looking forward to seeing your progress .