Lowering blocks

Very slightly.
But you can add some taper in the block to compensate for that if needed.

I made 1" blocks on my Dart.
But because my driveline-angle is off a bit because of A518 OD-transmission, I deal with correcting it properly when the trans is mounted high enough into the tunnel.

What did you make it out of. I was thinking some 1x2 steel bar stock.