400 into 65 valiant

mopowers said
According to TTI, the crankshaft centerline should be 4-3/4" from the K-frame for small blocks. I would use that as a good starting point when locating a big block. Footnote #39

There's some info on where I located the BB in my 66 in this thread: Early A Big Block And Motor Plate

Thank you! That's a great starting point!

How about front to back? Is there any kind of reference I could use? I suppose moving it back makes weight distribution better but considering a transmission needs to fit behind it ...

Good to see people still stuffing big blocks in these little early A's! Someone asked "why?" LOL I say WHY NOT?!

Couldn't agree more! :D