Early A Big Block And Motor Plate
So I was wrong. I ended up putting mine in closer to center than I thought. Here are the measurements TTI recommends for small block early A's:
Here's where mine landed. Passenger side to crank center: 13-1/2". Driver's side to crank center: 14-5/8". Difference is 1-1/8", or 9/16" off center obviously.