What he needs is a set of V8 engine mounts from a 64-66 A body, then he will need to modify the drivers side with a small triangle piece and he should be all set.
It's not the driver's side, but the passenger side that needs the triangular piece added. Also, and I know that drawing comes straight from the Mopar Performance manual, but that diagram is wrong for an early A, as I found out when I tried to duplicate it on my 65 Barracuda. Their diagram would be correct (I believe) for a 67 and later mount.