I put in an A500 in my 68 and didn’t modify the tunnel at all. The torsion bar cross member is another story, but it’s not difficult if you can use a torch and welder. You can also reuse the shift linkage and kick down linkage from your 904.
Did you replace a 904 or a 727 when you installed your A500 ?
When you did this swap. Did you notice any lose of power (like being lower on power/Parasitic loss) while daily driving ?
Also after doing the swap. Did you notice a free wheeling effect (overdrive) at cruising speeds ? Any MPG change. What rear gear are you using. How much power are pushing through that A500 ? Sorry for all the questions. Just want to make an educated plan.
