Trans Tunnel Modifications?

I am looking at installing a Lakewood safety bell housing in my '65 Valiant, but from what I've read so far, they don't fit too well, needing hammering of the tunnel, and even after all that it's still very tight.

Has anybody replaced the front part of the transmission tunnel with the same part from a 67-76 A-body? I can see that taking room away from the gas pedal location, so I'm not 100% sure I should go that route.

My Valiant is a 273, 904 car, and I've almost collected most of the parts to go with a 4-speed. How similar are the 4-speed humps for the early A-bodies compared to the later ones?