early A body engine swap
Getting back to the motor mount brackets, the 340/360 passenger side of the block has two mounting holes in front, one in the rear. 273/318 is the opposite.
For a long time, Ma Mopar made separate brackets for 340/360 on the one hand, and 273/318 on the other. Much later on (don't remember what year), they made passenger side brackets with two holes front and two holes rear, so the bracket could be used with either setup. Not sure how they dealt with the driver's side bracket, as the two block ears are not the same distance apart.
For early A's, to properly bolt up a 340/360, the passenger side needs an ear welded to the front part of the bracket, then a hole drilled, as described in post ##26 and 27. Here's mine:
Now, an unmodified 273 passenger bracket will bolt up to a 340/360 if you're comfortable using only two bolts instead of three. It's been done.
For the driver's side, a 340/360 will need a spacer (which can be as simple as a few washers) on the rear bolt. Mine:
Finally, I don't know the part numbers, but the early A motor mount biscuits are thicker than later ones. I used this to my advantage when installing TTI headers. The driver's side torsion bar passes between two of the tubes. My torsion bar fit between the two tubes, but it was so close I figured it would probably rattle. So I used the later, thinner, biscuit on the driver's side, which dropped the motor on that side just enough to provide adequate clearance between the torsion bar and the two header tubes. I did have to drill one hole in the bracket for the later biscuit's locating bump, as shown in the Jim Bowen link (post #43).
And, of course, if you run a 318, none of this will be necessary, as it can use the early A 273 brackets as is.
Getting back to the motor mount brackets, the 340/360 passenger side of the block has two mounting holes in front, one in the rear. 273/318 is the opposite.
For a long time, Ma Mopar made separate brackets for 340/360 on the one hand, and 273/318 on the other. Much later on (don't remember what year), they made passenger side brackets with two holes front and two holes rear, so the bracket could be used with either setup. Not sure how they dealt with the driver's side bracket, as the two block ears are not the same distance apart.
For early A's, to properly bolt up a 340/360, the passenger side needs an ear welded to the front part of the bracket, then a hole drilled, as described in post ##26 and 27. Here's mine:
Now, an unmodified 273 passenger bracket will bolt up to a 340/360 if you're comfortable using only two bolts instead of three. It's been done.
For the driver's side, a 340/360 will need a spacer (which can be as simple as a few washers) on the rear bolt. Mine:
Finally, I don't know the part numbers, but the early A motor mount biscuits are thicker than later ones. I used this to my advantage when installing TTI headers. The driver's side torsion bar passes between two of the tubes. My torsion bar fit between the two tubes, but it was so close I figured it would probably rattle. So I used the later, thinner, biscuit on the driver's side, which dropped the motor on that side just enough to provide adequate clearance between the torsion bar and the two header tubes. I did have to drill one hole in the bracket for the later biscuit's locating bump, as shown in the Jim Bowen link (post #43).
And, of course, if you run a 318, none of this will be necessary, as it can use the early A 273 brackets as is.